4- 20 mA Current Calibrator is used for power & current measurement of two wire loop. SPAC Systems is the supplier of 4- 20 mA Current Calibrator. SPAC Systems also supplies various types of magnetic dial stands, precision inspection bench centre, testing apparatus, ultrasonic thickness gauge, torque wrenches, shore hardness tester etc. 4- 20 mA Current Calibrator comes under the model number- CC-420. This Current Calibrator comes in 0-24 mA ranges and comes with LCD display.