The dual channel echo sounder is a marine ultrasonic echo sounder that uses ultrasonic waves to measure the depth of the waters where the ship is stationary or sailing, so that the crew on board can understand the real-time water depth and avoid the ship running aground. This instrument has two measurement channels and a color echo display, with clear images, simple operation, and strong reliability. It can continuously and stably measure the bottom depth and draw echo images. This instrument also has shallow water alarm, data storage, history playback, data output and other functions.