... measure of distance. And comparable foreign SRF05, SRF02 Ultrasonic Ranging Module. Module precision, blind spots (2cm) ... to 0.3cm8: Panel wiring, VCC, trig 's (control side), the echo (receiving end), out (empty feet), ... a high IO output, high duration of the ultrasonic time from launch to return.Test distance = ( ... ;This product is simple to use, and a Control Port high above a 10US, you can wait for ...