The PD9502 is a low-cost, compact, simple to use
4-20 mA or 0-10 VDC signal generator. It can easily be set
for 0-20 mA, 4-20 mA, 0-10 V or 2-10 V ranges. Signal
adjustment is made with a one-turn knob. A 15-27 VDC
wall plug is provided with the instrument.