An amplifier is a device that combines a sensor with a small signal precision amplification circuit. The internal circuit is elegant, with constant current supply bridge, voltage current conversion, impedance adaptation, linear compensation, temperature compensation, etc. It converts mechanical quantities into standard current and voltage signals for output. 4-20mA, 0-10mA, 0-5V, 1-5V are directly connected to automatic control equipment or computer networking. The transmitter has zero and gain adjustment functions.