The JSN-SR04T / AJ-SR04M Waterproof Ultrasonic Distance Sensor Module is a high-performance waterproof ranging sensor designed for non-contact distance and level measurement in wet or harsh environments.
Using ultrasonic wave reflection technology, the sensor emits high-frequency sound waves and measures the time taken for the echo to return, providing accurate distance data from 20cm to 600cm.
The fully sealed transducer head makes it suitable for outdoor use, water level monitoring, and industrial automation. It interfaces easily with Arduino, ESP32, STM32, and Raspberry Pi through a standard 4-pin connection and outputs precise distance readings via pulse width signals.