SRF05 five Pin Ultrasonic ranging module Ultrasonic sensor Specification1. voltage: DC5V2: ... is stable and precise measure of distance. And comparable foreign SRF05, SRF02 Ultrasonic Ranging Module. Module precision, blind spots (2cm) super ... distance = (time high * speed of sound (340M / S)) / 2 HY-SRF05 SRF05 Ultrasonic ranging module Ultrasonic sensor Quaranteed 100%