Widely used in motor speed detection, pulse-counting, any position, possesses 2 road testing. 
Module unique : 
1.trough-like optocoupler use sensor 
2.tank width 5mm . 
3.have export status indicator , output level lamp expirate , output low level lamp bright . 
4.have sunling , output low level; none sunling , output high level . 
5.comparator output , signal clean , waveform good , riving capacity strong , more than 15ma. 
6.working voltage 3.3v-5v 
7.output : form digital switch output ( 0 and 1 ) 
8.with fitted bolt hole , convenient installation 
9.small PCB measurement: 3.2cm 1.7cm x 
10.use LM393 wide voltage comparator 
Module how to use : 
1. module tank in none shade from , receiver tube breakover , module do output low level , when sunling , do output high level . 
2. module can do with relay connected , composition of limit switch etc function , with active buzzer module connected , composition alarm . 
Invoice : 
2 road velocimetry sensors module , with two trough-like optocoupler , 2 sensors small PCB board , 8 20cm DuPont line strip 
Included 
1 x 2 Road Velocimetry Sensor Module