... Output:RS485,4~20mA Ultrasonic Level Sensor UE3000 HOLYKELL small blind precision ultrasonic sensors, designed for high precision, small blind, ... sensors, temperature sensors, ultrasonic servo circuit, display, control signal output, the transmitter circuit as a whole, using SMD ... ASC developed ASIC, so that the circuit very compact machine, simple; circuit board all the gold-plated, internal ...