5/1pcs Speed Sensor Module Slot-type IR Optocoupler LM393 For Arduino Groove Coupler Sensor 3.3V-5V Connect Relay Buzzer Module
USD 0.22USD 0.30
5/1pcs Speed Sensor Module Slot-type IR Optocoupler LM393 For Arduino Groove Coupler Sensor 3.3V-5V Connect Relay Buzzer Module