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3PCS HC-SR04 Ultrasonic Sensor Module Distance Measuring Sensor Module Ultrasonic Ranging Module + 3 Sets Mounting Bracket with Cable health_UK_Nov2022 A supplement is a great3PCS HC SR04 Ultrasonic Sensor Module Distance Measuring Sensor Module Ultrasonic Ranging Module + 3 Sets Mounting Bracket with Cable Characteristic: The HC SR04 ultrasonic distance measuring module provides non contact distance measuring function from 2cm to 450cm and high distance accuracy up to 3mm. Module consisting of ultrasonic transmitter, receiver and control circuit. Basic working principle: 1. Use IO mouth TRIG trigger distance, at least 10