The Fluke 709 Precision Loop Calibrator is built around a user friendly interface with a Quick-Set rotary encoder knob. The protective holster easily fits into a technician?s hand and the large backlit display is easy to read, even in dark, cramped worked areas. The 709 offers:Best-in-class accuracy at 0.01% readingSmall rugged design operates on (6) standard AAA batteriesIntuitive user interface with Quick-Set knob for fast setup, easy useBuilt-in selectable 250 ? resistor for HART communication24 V dc loop power with mA Measure Mode (-25% to 125%)Resolution of 1 ?A on mA ranges and 1 mV on voltages rangesSimple two-wire connection for all measurementsAuto Shutdown to conserve battery life (adjustable up to 30 minutes)Variable step & ramp time in secondsAdjustable span selection (0 to 20 mA or 4 to 20 mA)Valve Test (simulate defined mA values with % keys)