1. Small size and easy to use; The dual probe distance measuring module can provide a non-contact distance detection function from 2cm to 500cm, and the measurement accuracy can be up to 3mm; The module includes an ultrasonic sensor and a control circuit which transceiver and transmitter. The use of mode 1 is compatible with for the -Sro4 module. 2. Ultra-small blind zone measurement. Designed with industrial dual waterproof ultrasonic probes, waterproof and stable performance 4. Strong anti-interference 3. High accuracy of measurement; ultra-short range, the blind area is only 2 cm. Stable range 5. Enclosed waterproof probe integrated with cable, suitable for wet and difficult measurement situations, Weight: 0.110231131 pounds, Manufacturer: Faeymth