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50% off
Non-Contact Liquid Level Sensor, Water Level Controller, Water Level Sensor, Water Tank Switch Non-Contact Liquid Level Sensor, Water Level Controller, Water Level Sensor, Water Tank Switch

Non-Contact Liquid Level Sensor, Water Level Controller, Water Level Sensor, Water Tank Switch

$25.66$51.32

41% off
High Level Trigger DC Control DC Solid-State Relay Module Single-Phase Electric Relay Solid State 5A High Level Trigger DC Control DC Solid-State Relay Module Single-Phase Electric Relay Solid State 5A

High Level Trigger DC Control DC Solid-State Relay Module Single-Phase Electric Relay Solid State 5A

$3.89$6.60

34% off
(1 Group Of 3 Colors) 1.5M 2.5M 3.5M Water Level Controller, Tank Water Level Control Induction Sensor Head Three Probe (1 Group Of 3 Colors) 1.5M 2.5M 3.5M Water Level Controller, Tank Water Level Control Induction Sensor Head Three Probe

(1 Group Of 3 Colors) 1.5M 2.5M 3.5M Water Level Controller, Tank Water Level Control Induction Sensor Head Three Probe

$6.91$10.47

32% off
16-Way Relay Control Module/Isolated Expansion Module/High/Low Level Trigger/5V/12V/24V 16-Way Relay Control Module/Isolated Expansion Module/High/Low Level Trigger/5V/12V/24V

16-Way Relay Control Module/Isolated Expansion Module/High/Low Level Trigger/5V/12V/24V

$20.07$29.51

56% off
380V 8A SSR Board Solid State Relay Module High Low Level H-L Trigger Board D3808 Controller For Arduino 380V 8A SSR Board Solid State Relay Module High Low Level H-L Trigger Board D3808 Controller For Arduino

380V 8A SSR Board Solid State Relay Module High Low Level H-L Trigger Board D3808 Controller For Arduino

$10.30$23.42

DIY Retro Level Indicator LED Music Spectrum LED Audio Level Indicator Pick-Up Rhythm Light Voice Controlled DIY Retro Level Indicator LED Music Spectrum LED Audio Level Indicator Pick-Up Rhythm Light Voice Controlled

DIY Retro Level Indicator LED Music Spectrum LED Audio Level Indicator Pick-Up Rhythm Light Voice Controlled

$16.30$16.30

23% off
1 Pcs 30A 4 Channel Relay Module High Low Level Trigger Module Solid State Relay Module Trigger Relay 1 Pcs 30A 4 Channel Relay Module High Low Level Trigger Module Solid State Relay Module Trigger Relay

1 Pcs 30A 4 Channel Relay Module High Low Level Trigger Module Solid State Relay Module Trigger Relay

$13.36$17.35

28% off
8 Way 5V/12V/24V High And Low Level Optocoupler Isolation Relay Control Module Single-Chip PLC Amplifier Board 8 Way 5V/12V/24V High And Low Level Optocoupler Isolation Relay Control Module Single-Chip PLC Amplifier Board

8 Way 5V/12V/24V High And Low Level Optocoupler Isolation Relay Control Module Single-Chip PLC Amplifier Board

$16.06$22.31

33% off
16-Way Relay Control Module/Isolated Expansion Module/High/Low Level Trigger/5V/12V/24V 16-Way Relay Control Module/Isolated Expansion Module/High/Low Level Trigger/5V/12V/24V

16-Way Relay Control Module/Isolated Expansion Module/High/Low Level Trigger/5V/12V/24V

$20.11$30.02

48% off
Xh-M203 Full Automatic Water Level Controller Pump Switch Module Ac/Dc 12V Relay Sensors Xh-M203 Full Automatic Water Level Controller Pump Switch Module Ac/Dc 12V Relay Sensors

Xh-M203 Full Automatic Water Level Controller Pump Switch Module Ac/Dc 12V Relay Sensors

$2.96$5.69

28% off
MQ131 Concentration Ozone Sensor Gas Sensor Module For Ozone Concentration Analog TTL Level Output MQ131 Concentration Ozone Sensor Gas Sensor Module For Ozone Concentration Analog TTL Level Output

MQ131 Concentration Ozone Sensor Gas Sensor Module For Ozone Concentration Analog TTL Level Output

$18.23$25.32

51% off
Expansion Board With Optocoupler Low Level Trigger Expansion Board For Raspberry Pi Expansion Board With Optocoupler Low Level Trigger Expansion Board For Raspberry Pi

Expansion Board With Optocoupler Low Level Trigger Expansion Board For Raspberry Pi

$53.11$108.38

10% off
MQ137 Ammonia Gas Detection Sensor Module NH3 Gas Sensor Module Household Appliance Accessories Analog TTL Level Output MQ137 Ammonia Gas Detection Sensor Module NH3 Gas Sensor Module Household Appliance Accessories Analog TTL Level Output

MQ137 Ammonia Gas Detection Sensor Module NH3 Gas Sensor Module Household Appliance Accessories Analog TTL Level Output

$18.71$20.92

4% off
2 PCS 5V One Channel Relay Module Relay Switch With Optocoupler Isolation Support High Low Level Trigger 2 PCS 5V One Channel Relay Module Relay Switch With Optocoupler Isolation Support High Low Level Trigger

2 PCS 5V One Channel Relay Module Relay Switch With Optocoupler Isolation Support High Low Level Trigger

$2.93$3.06

34% off
2 Piece 5V One Channel Relay Module With Optocoupler Isolation Support High Low Level Trigger 2 Piece 5V One Channel Relay Module With Optocoupler Isolation Support High Low Level Trigger

2 Piece 5V One Channel Relay Module With Optocoupler Isolation Support High Low Level Trigger

$3.28$4.97

32% off
1 Pcs 30A 4 Channel Relay Module High Low Level Trigger Module Solid State Relay Module Trigger Relay 1 Pcs 30A 4 Channel Relay Module High Low Level Trigger Module Solid State Relay Module Trigger Relay

1 Pcs 30A 4 Channel Relay Module High Low Level Trigger Module Solid State Relay Module Trigger Relay

$13.40$19.71

41% off
High Mid Low Level Indicator DC 12V Water Liquid Level Controller Sensor Switch Relay Module For Motor Fish Tank High Mid Low Level Indicator DC 12V Water Liquid Level Controller Sensor Switch Relay Module For Motor Fish Tank

High Mid Low Level Indicator DC 12V Water Liquid Level Controller Sensor Switch Relay Module For Motor Fish Tank

$4.11$6.96

29% off
Water Liquid Level Controller Sensor Module Water Level Detection Sensor Pumping Drainage Protection Circuit Board Water Liquid Level Controller Sensor Module Water Level Detection Sensor Pumping Drainage Protection Circuit Board

Water Liquid Level Controller Sensor Module Water Level Detection Sensor Pumping Drainage Protection Circuit Board

$3.15$4.43

27% off
Sensor Detection Module 79G Millimeter Wave Level LD8001B Non-Contact Radar High Precision Level Measurement Module Sensor Detection Module 79G Millimeter Wave Level LD8001B Non-Contact Radar High Precision Level Measurement Module

Sensor Detection Module 79G Millimeter Wave Level LD8001B Non-Contact Radar High Precision Level Measurement Module

$41.85$57.33

33% off
MQ137 Ammonia Gas Detection Sensor Module NH3 Gas Sensor Module Household Appliance Accessories Analog TTL Level Output MQ137 Ammonia Gas Detection Sensor Module NH3 Gas Sensor Module Household Appliance Accessories Analog TTL Level Output

MQ137 Ammonia Gas Detection Sensor Module NH3 Gas Sensor Module Household Appliance Accessories Analog TTL Level Output

$15.89$23.72

30% off
12V Relay Module Expansion Board With Optocoupler Low Level Trigger Expansion Board For Raspberry Pi 12V Relay Module Expansion Board With Optocoupler Low Level Trigger Expansion Board For Raspberry Pi

12V Relay Module Expansion Board With Optocoupler Low Level Trigger Expansion Board For Raspberry Pi

$11.29$16.13

40% off
HW-883 1 Channel 5V Low Level Solid State Relay Module With Fuses Solid State Relay 250V2A HW-883 1 Channel 5V Low Level Solid State Relay Module With Fuses Solid State Relay 250V2A

HW-883 1 Channel 5V Low Level Solid State Relay Module With Fuses Solid State Relay 250V2A

$8.72$14.53

24% off
GRL8 Water Level Controller Liquid Relay 10A AC DC 24V 220V Wide Range Voltage Water Pump Relay GRL8 Water Level Controller Liquid Relay 10A AC DC 24V 220V Wide Range Voltage Water Pump Relay

GRL8 Water Level Controller Liquid Relay 10A AC DC 24V 220V Wide Range Voltage Water Pump Relay

$19.08$25.11

31% off
1 Pieces 30A 4 Channel Relay Module High Low Level Trigger Module Solid State Relay Module Trigger Relay 1 Pieces 30A 4 Channel Relay Module High Low Level Trigger Module Solid State Relay Module Trigger Relay

1 Pieces 30A 4 Channel Relay Module High Low Level Trigger Module Solid State Relay Module Trigger Relay

$12.79$18.54

61% off
16 Channel 12V Relay Module Expansion Board With Optocoupler Low Level Trigger Expansion Board For Raspberry Pi 16 Channel 12V Relay Module Expansion Board With Optocoupler Low Level Trigger Expansion Board For Raspberry Pi

16 Channel 12V Relay Module Expansion Board With Optocoupler Low Level Trigger Expansion Board For Raspberry Pi

$6.86$17.59

39% off
HY-M281 8 Channel Solid State Relay Module Low Level Driver Relay Module With Fuse 5V Low Level Trigger HY-M281 8 Channel Solid State Relay Module Low Level Driver Relay Module With Fuse 5V Low Level Trigger

HY-M281 8 Channel Solid State Relay Module Low Level Driver Relay Module With Fuse 5V Low Level Trigger

$10.01$16.41

49% off
Non-Contact Liquid Level Sensor, Water Level Controller, Water Level Sensor, Water Tank Switch Non-Contact Liquid Level Sensor, Water Level Controller, Water Level Sensor, Water Tank Switch

Non-Contact Liquid Level Sensor, Water Level Controller, Water Level Sensor, Water Tank Switch

$25.82$50.62

37% off
1 Pieces 2 Channel Relay Module 30A High-Low Level Trigger Control Relay Module Relay Switch Board 1 Pieces 2 Channel Relay Module 30A High-Low Level Trigger Control Relay Module Relay Switch Board

1 Pieces 2 Channel Relay Module 30A High-Low Level Trigger Control Relay Module Relay Switch Board

$8.14$12.92

1 Pieces 2 Channel Relay Module 30A High-Low Level Trigger Control Relay Module Relay Switch Board 1 Pieces 2 Channel Relay Module 30A High-Low Level Trigger Control Relay Module Relay Switch Board

1 Pieces 2 Channel Relay Module 30A High-Low Level Trigger Control Relay Module Relay Switch Board

$59.75$59.75

40% off
Water Liquid Level Controller Sensor Module Water Level Detection Sensor Pumping Drainage Protection Circuit Board Water Liquid Level Controller Sensor Module Water Level Detection Sensor Pumping Drainage Protection Circuit Board

Water Liquid Level Controller Sensor Module Water Level Detection Sensor Pumping Drainage Protection Circuit Board

$3.97$6.62

23% off
16 Channel Expansion Board With Optocoupler Low Level Trigger Expansion Board For Raspberry Pi 16 Channel Expansion Board With Optocoupler Low Level Trigger Expansion Board For Raspberry Pi

16 Channel Expansion Board With Optocoupler Low Level Trigger Expansion Board For Raspberry Pi

$9.99$12.97

40% off
GRL8 Water Level Controller Liquid Relay 10A AC DC 24V 220V Wide Range Voltage Water Pump Relay GRL8 Water Level Controller Liquid Relay 10A AC DC 24V 220V Wide Range Voltage Water Pump Relay

GRL8 Water Level Controller Liquid Relay 10A AC DC 24V 220V Wide Range Voltage Water Pump Relay

$18.09$30.15

16 Channel 12V Relay Module With Optocoupler Low Level Trigger Expansion Board For Raspberry Pi Arduino 16 Channel 12V Relay Module With Optocoupler Low Level Trigger Expansion Board For Raspberry Pi Arduino

16 Channel 12V Relay Module With Optocoupler Low Level Trigger Expansion Board For Raspberry Pi Arduino

$11.69$11.69

HW-883 1 Channel 5V Low Level Solid State Relay Module With Fuses Solid State Relay 250V2A HW-883 1 Channel 5V Low Level Solid State Relay Module With Fuses Solid State Relay 250V2A

HW-883 1 Channel 5V Low Level Solid State Relay Module With Fuses Solid State Relay 250V2A

$9.81$9.81

20% off
1 Pcs 2 Channel Relay Module 30A High-Low Level Trigger Control Relay Module Relay Switch Board 1 Pcs 2 Channel Relay Module 30A High-Low Level Trigger Control Relay Module Relay Switch Board

1 Pcs 2 Channel Relay Module 30A High-Low Level Trigger Control Relay Module Relay Switch Board

$8.94$11.18

32% off
1 Piece RCWL-1670 Waterproof Transceiver 2Cm-400Cm Distance DC3-5V For Water Level Measurement 1 Piece RCWL-1670 Waterproof Transceiver 2Cm-400Cm Distance DC3-5V For Water Level Measurement

1 Piece RCWL-1670 Waterproof Transceiver 2Cm-400Cm Distance DC3-5V For Water Level Measurement

$5.68$8.35

50% off
Non-Contact Liquid Level Sensor, Water Level Controller, Water Level Sensor, Water Tank Switch Non-Contact Liquid Level Sensor, Water Level Controller, Water Level Sensor, Water Tank Switch

Non-Contact Liquid Level Sensor, Water Level Controller, Water Level Sensor, Water Tank Switch

$25.66 $51.32

Categories: Security & Protection, Building Automation

Buy Now
41% off
High Level Trigger DC Control DC Solid-State Relay Module Single-Phase Electric Relay Solid State 5A High Level Trigger DC Control DC Solid-State Relay Module Single-Phase Electric Relay Solid State 5A

High Level Trigger DC Control DC Solid-State Relay Module Single-Phase Electric Relay Solid State 5A

$3.89 $6.60

Categories: Security & Protection, Building Automation

Buy Now
34% off
(1 Group Of 3 Colors) 1.5M 2.5M 3.5M Water Level Controller, Tank Water Level Control Induction Sensor Head Three Probe (1 Group Of 3 Colors) 1.5M 2.5M 3.5M Water Level Controller, Tank Water Level Control Induction Sensor Head Three Probe

(1 Group Of 3 Colors) 1.5M 2.5M 3.5M Water Level Controller, Tank Water Level Control Induction Sensor Head Three Probe

$6.91 $10.47

Categories: Security & Protection, Building Automation

Buy Now
32% off
16-Way Relay Control Module/Isolated Expansion Module/High/Low Level Trigger/5V/12V/24V 16-Way Relay Control Module/Isolated Expansion Module/High/Low Level Trigger/5V/12V/24V

16-Way Relay Control Module/Isolated Expansion Module/High/Low Level Trigger/5V/12V/24V

$20.07 $29.51

Categories: Security & Protection, Building Automation

Buy Now
56% off
380V 8A SSR Board Solid State Relay Module High Low Level H-L Trigger Board D3808 Controller For Arduino 380V 8A SSR Board Solid State Relay Module High Low Level H-L Trigger Board D3808 Controller For Arduino

380V 8A SSR Board Solid State Relay Module High Low Level H-L Trigger Board D3808 Controller For Arduino

$10.30 $23.42

Categories: Security & Protection, Building Automation

Buy Now
DIY Retro Level Indicator LED Music Spectrum LED Audio Level Indicator Pick-Up Rhythm Light Voice Controlled DIY Retro Level Indicator LED Music Spectrum LED Audio Level Indicator Pick-Up Rhythm Light Voice Controlled

DIY Retro Level Indicator LED Music Spectrum LED Audio Level Indicator Pick-Up Rhythm Light Voice Controlled

$16.30 $16.30

Categories: Security & Protection, Building Automation

Buy Now
23% off
1 Pcs 30A 4 Channel Relay Module High Low Level Trigger Module Solid State Relay Module Trigger Relay 1 Pcs 30A 4 Channel Relay Module High Low Level Trigger Module Solid State Relay Module Trigger Relay

1 Pcs 30A 4 Channel Relay Module High Low Level Trigger Module Solid State Relay Module Trigger Relay

$13.36 $17.35

Categories: Security & Protection, Building Automation

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28% off
8 Way 5V/12V/24V High And Low Level Optocoupler Isolation Relay Control Module Single-Chip PLC Amplifier Board 8 Way 5V/12V/24V High And Low Level Optocoupler Isolation Relay Control Module Single-Chip PLC Amplifier Board

8 Way 5V/12V/24V High And Low Level Optocoupler Isolation Relay Control Module Single-Chip PLC Amplifier Board

$16.06 $22.31

Categories: Security & Protection, Building Automation

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33% off
16-Way Relay Control Module/Isolated Expansion Module/High/Low Level Trigger/5V/12V/24V 16-Way Relay Control Module/Isolated Expansion Module/High/Low Level Trigger/5V/12V/24V

16-Way Relay Control Module/Isolated Expansion Module/High/Low Level Trigger/5V/12V/24V

$20.11 $30.02

Categories: Security & Protection, Building Automation

Buy Now
48% off
Xh-M203 Full Automatic Water Level Controller Pump Switch Module Ac/Dc 12V Relay Sensors Xh-M203 Full Automatic Water Level Controller Pump Switch Module Ac/Dc 12V Relay Sensors

Xh-M203 Full Automatic Water Level Controller Pump Switch Module Ac/Dc 12V Relay Sensors

$2.96 $5.69

Categories: Security & Protection, Building Automation

Buy Now
28% off
MQ131 Concentration Ozone Sensor Gas Sensor Module For Ozone Concentration Analog TTL Level Output MQ131 Concentration Ozone Sensor Gas Sensor Module For Ozone Concentration Analog TTL Level Output

MQ131 Concentration Ozone Sensor Gas Sensor Module For Ozone Concentration Analog TTL Level Output

$18.23 $25.32

Categories: Security & Protection, Building Automation

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51% off
Expansion Board With Optocoupler Low Level Trigger Expansion Board For Raspberry Pi Expansion Board With Optocoupler Low Level Trigger Expansion Board For Raspberry Pi

Expansion Board With Optocoupler Low Level Trigger Expansion Board For Raspberry Pi

$53.11 $108.38

Categories: Security & Protection, Building Automation

Buy Now
10% off
MQ137 Ammonia Gas Detection Sensor Module NH3 Gas Sensor Module Household Appliance Accessories Analog TTL Level Output MQ137 Ammonia Gas Detection Sensor Module NH3 Gas Sensor Module Household Appliance Accessories Analog TTL Level Output

MQ137 Ammonia Gas Detection Sensor Module NH3 Gas Sensor Module Household Appliance Accessories Analog TTL Level Output

$18.71 $20.92

Categories: Security & Protection, Building Automation

Buy Now
4% off
2 PCS 5V One Channel Relay Module Relay Switch With Optocoupler Isolation Support High Low Level Trigger 2 PCS 5V One Channel Relay Module Relay Switch With Optocoupler Isolation Support High Low Level Trigger

2 PCS 5V One Channel Relay Module Relay Switch With Optocoupler Isolation Support High Low Level Trigger

$2.93 $3.06

Categories: Security & Protection, Building Automation

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34% off
2 Piece 5V One Channel Relay Module With Optocoupler Isolation Support High Low Level Trigger 2 Piece 5V One Channel Relay Module With Optocoupler Isolation Support High Low Level Trigger

2 Piece 5V One Channel Relay Module With Optocoupler Isolation Support High Low Level Trigger

$3.28 $4.97

Categories: Security & Protection, Building Automation

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32% off
1 Pcs 30A 4 Channel Relay Module High Low Level Trigger Module Solid State Relay Module Trigger Relay 1 Pcs 30A 4 Channel Relay Module High Low Level Trigger Module Solid State Relay Module Trigger Relay

1 Pcs 30A 4 Channel Relay Module High Low Level Trigger Module Solid State Relay Module Trigger Relay

$13.40 $19.71

Categories: Security & Protection, Building Automation

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41% off
High Mid Low Level Indicator DC 12V Water Liquid Level Controller Sensor Switch Relay Module For Motor Fish Tank High Mid Low Level Indicator DC 12V Water Liquid Level Controller Sensor Switch Relay Module For Motor Fish Tank

High Mid Low Level Indicator DC 12V Water Liquid Level Controller Sensor Switch Relay Module For Motor Fish Tank

$4.11 $6.96

Categories: Security & Protection, Building Automation

Buy Now
29% off
Water Liquid Level Controller Sensor Module Water Level Detection Sensor Pumping Drainage Protection Circuit Board Water Liquid Level Controller Sensor Module Water Level Detection Sensor Pumping Drainage Protection Circuit Board

Water Liquid Level Controller Sensor Module Water Level Detection Sensor Pumping Drainage Protection Circuit Board

$3.15 $4.43

Categories: Security & Protection, Building Automation

Buy Now
27% off
Sensor Detection Module 79G Millimeter Wave Level LD8001B Non-Contact Radar High Precision Level Measurement Module Sensor Detection Module 79G Millimeter Wave Level LD8001B Non-Contact Radar High Precision Level Measurement Module

Sensor Detection Module 79G Millimeter Wave Level LD8001B Non-Contact Radar High Precision Level Measurement Module

$41.85 $57.33

Categories: Security & Protection, Building Automation

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33% off
MQ137 Ammonia Gas Detection Sensor Module NH3 Gas Sensor Module Household Appliance Accessories Analog TTL Level Output MQ137 Ammonia Gas Detection Sensor Module NH3 Gas Sensor Module Household Appliance Accessories Analog TTL Level Output

MQ137 Ammonia Gas Detection Sensor Module NH3 Gas Sensor Module Household Appliance Accessories Analog TTL Level Output

$15.89 $23.72

Categories: Security & Protection, Building Automation

Buy Now
30% off
12V Relay Module Expansion Board With Optocoupler Low Level Trigger Expansion Board For Raspberry Pi 12V Relay Module Expansion Board With Optocoupler Low Level Trigger Expansion Board For Raspberry Pi

12V Relay Module Expansion Board With Optocoupler Low Level Trigger Expansion Board For Raspberry Pi

$11.29 $16.13

Categories: Security & Protection, Building Automation

Buy Now
40% off
HW-883 1 Channel 5V Low Level Solid State Relay Module With Fuses Solid State Relay 250V2A HW-883 1 Channel 5V Low Level Solid State Relay Module With Fuses Solid State Relay 250V2A

HW-883 1 Channel 5V Low Level Solid State Relay Module With Fuses Solid State Relay 250V2A

$8.72 $14.53

Categories: Security & Protection, Building Automation

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24% off
GRL8 Water Level Controller Liquid Relay 10A AC DC 24V 220V Wide Range Voltage Water Pump Relay GRL8 Water Level Controller Liquid Relay 10A AC DC 24V 220V Wide Range Voltage Water Pump Relay

GRL8 Water Level Controller Liquid Relay 10A AC DC 24V 220V Wide Range Voltage Water Pump Relay

$19.08 $25.11

Categories: Security & Protection, Building Automation

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31% off
1 Pieces 30A 4 Channel Relay Module High Low Level Trigger Module Solid State Relay Module Trigger Relay 1 Pieces 30A 4 Channel Relay Module High Low Level Trigger Module Solid State Relay Module Trigger Relay

1 Pieces 30A 4 Channel Relay Module High Low Level Trigger Module Solid State Relay Module Trigger Relay

$12.79 $18.54

Categories: Security & Protection, Building Automation

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61% off
16 Channel 12V Relay Module Expansion Board With Optocoupler Low Level Trigger Expansion Board For Raspberry Pi 16 Channel 12V Relay Module Expansion Board With Optocoupler Low Level Trigger Expansion Board For Raspberry Pi

16 Channel 12V Relay Module Expansion Board With Optocoupler Low Level Trigger Expansion Board For Raspberry Pi

$6.86 $17.59

Categories: Security & Protection, Building Automation

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39% off
HY-M281 8 Channel Solid State Relay Module Low Level Driver Relay Module With Fuse 5V Low Level Trigger HY-M281 8 Channel Solid State Relay Module Low Level Driver Relay Module With Fuse 5V Low Level Trigger

HY-M281 8 Channel Solid State Relay Module Low Level Driver Relay Module With Fuse 5V Low Level Trigger

$10.01 $16.41

Categories: Security & Protection, Building Automation

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49% off
Non-Contact Liquid Level Sensor, Water Level Controller, Water Level Sensor, Water Tank Switch Non-Contact Liquid Level Sensor, Water Level Controller, Water Level Sensor, Water Tank Switch

Non-Contact Liquid Level Sensor, Water Level Controller, Water Level Sensor, Water Tank Switch

$25.82 $50.62

Categories: Security & Protection, Building Automation

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37% off
1 Pieces 2 Channel Relay Module 30A High-Low Level Trigger Control Relay Module Relay Switch Board 1 Pieces 2 Channel Relay Module 30A High-Low Level Trigger Control Relay Module Relay Switch Board

1 Pieces 2 Channel Relay Module 30A High-Low Level Trigger Control Relay Module Relay Switch Board

$8.14 $12.92

Categories: Security & Protection, Building Automation

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1 Pieces 2 Channel Relay Module 30A High-Low Level Trigger Control Relay Module Relay Switch Board 1 Pieces 2 Channel Relay Module 30A High-Low Level Trigger Control Relay Module Relay Switch Board

1 Pieces 2 Channel Relay Module 30A High-Low Level Trigger Control Relay Module Relay Switch Board

$59.75 $59.75

Categories: Security & Protection, Building Automation

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40% off
Water Liquid Level Controller Sensor Module Water Level Detection Sensor Pumping Drainage Protection Circuit Board Water Liquid Level Controller Sensor Module Water Level Detection Sensor Pumping Drainage Protection Circuit Board

Water Liquid Level Controller Sensor Module Water Level Detection Sensor Pumping Drainage Protection Circuit Board

$3.97 $6.62

Categories: Security & Protection, Building Automation

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23% off
16 Channel Expansion Board With Optocoupler Low Level Trigger Expansion Board For Raspberry Pi 16 Channel Expansion Board With Optocoupler Low Level Trigger Expansion Board For Raspberry Pi

16 Channel Expansion Board With Optocoupler Low Level Trigger Expansion Board For Raspberry Pi

$9.99 $12.97

Categories: Security & Protection, Building Automation

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40% off
GRL8 Water Level Controller Liquid Relay 10A AC DC 24V 220V Wide Range Voltage Water Pump Relay GRL8 Water Level Controller Liquid Relay 10A AC DC 24V 220V Wide Range Voltage Water Pump Relay

GRL8 Water Level Controller Liquid Relay 10A AC DC 24V 220V Wide Range Voltage Water Pump Relay

$18.09 $30.15

Categories: Security & Protection, Building Automation

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16 Channel 12V Relay Module With Optocoupler Low Level Trigger Expansion Board For Raspberry Pi Arduino 16 Channel 12V Relay Module With Optocoupler Low Level Trigger Expansion Board For Raspberry Pi Arduino

16 Channel 12V Relay Module With Optocoupler Low Level Trigger Expansion Board For Raspberry Pi Arduino

$11.69 $11.69

Categories: Security & Protection, Building Automation

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HW-883 1 Channel 5V Low Level Solid State Relay Module With Fuses Solid State Relay 250V2A HW-883 1 Channel 5V Low Level Solid State Relay Module With Fuses Solid State Relay 250V2A

HW-883 1 Channel 5V Low Level Solid State Relay Module With Fuses Solid State Relay 250V2A

$9.81 $9.81

Categories: Security & Protection, Building Automation

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20% off
1 Pcs 2 Channel Relay Module 30A High-Low Level Trigger Control Relay Module Relay Switch Board 1 Pcs 2 Channel Relay Module 30A High-Low Level Trigger Control Relay Module Relay Switch Board

1 Pcs 2 Channel Relay Module 30A High-Low Level Trigger Control Relay Module Relay Switch Board

$8.94 $11.18

Categories: Security & Protection, Building Automation

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32% off
1 Piece RCWL-1670 Waterproof Transceiver 2Cm-400Cm Distance DC3-5V For Water Level Measurement 1 Piece RCWL-1670 Waterproof Transceiver 2Cm-400Cm Distance DC3-5V For Water Level Measurement

1 Piece RCWL-1670 Waterproof Transceiver 2Cm-400Cm Distance DC3-5V For Water Level Measurement

$5.68 $8.35

Categories: Security & Protection, Building Automation

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