The mAcal Calibrator is an economical and easy-to-use calibration device for sourcing and measuring mA signals. The instrument is designed specifically for 2-wire transmitter loops with 4 to 20 mA signals,The keypad is easy-to-use and provides positive tactile feedback. A large, high-contrast 5-digit LCD display indicates numeric values in mA, %, V, or sec. The resolution is 0.001 mA in measurement mode. The user can change the display to read in % of Full Scale. The display also indicates error codes, visual warnings are displayed for loop mismatch, reverse polarity, and over range, it is also equipped with a user adjustable automatic shut-off feature.The mAcal provides loop power in the range of 0 to 45 VDC, and the instrument is designed to generate a stable 24 VDC supply for the loop. The instrument features special fixed steps for performing linear and flow transmitter or valve positioner calibrations. The instrument has seven different built-in current values, and the user may choose between manual or automatic steps with 10 or 30 seconds between steps. You can perform an entire test by placing the mAcal in the process loop and take readings from the control room.