Tests/ calibrates instruments operating on 4-20 mA DC signal High accuracy : 0.1% FSD - Bench top accuracy in a Tool Box Calibrator Multifunction capability: Sources 4-20 mA; Reads 0-20 mA; Simulates 2-wireTransmitter and powers 2 Wire Transmitter and measures its mA output in the range 4-20 mA Instant check of 4 mA & 20 mA end points; and also fast check of any intermediate point in both Source & 2-wire Transmitter simulate mode Circuit design ensures stability of set current regardless of changes in voltage and load Large clear 3½ digit LCD, 0.5" high Portable, rugged and dry cell powered - Ideal for use in field & control room