Brgithwin Handheld portable 4-20mA signal generator is widely used in valve, PLC, DCS 4-20mA signal adjustment and calibration, transmitter’s 4-20mA output signal simulation. That current signal generator can also be used as a current source meter or 4-20mA calibrator. It’s 4-20mA or 0-20mA current output signal displays in the LED meter, it makes use easy to check its output status.  Its power supply can be 5V, 12V external ac to dc power adapter or re-chargeable battery. It is small size, high accuracy, easy to carry.