5PCS Slot Type IR Optocoupler Speed Sensor Module LM393 for Arduino

10Pcs LM393 Slot-type 4Pin Optocoupler Speed Sensor Measuring Module for Arduino

2PCS Slot Type IR Optocoupler Speed Sensor Module LM393 for Arduino/51/AVR/PIC

5PCS 3.3V-5V Slot Type IR Optocoupler Speed Sensor Module LM393 for Arduino

20Pcs LM393 Slot-type 4Pin Optocoupler Speed Sensor Measuring Module for Arduino

10pcs Speed Sensor module LM393 Optocoupler Speed Measuring Sensor for Arduino

2PCS Slot Type IR Optocoupler Speed Sensor Module LM393 for Arduino/51/AVR/PIC

5A/20A/30A Range ACS712/GY712/ZMCT103C Current Sensor Module for Arduino DIY