Designed for testing low voltage electrical installations, particularly in locations that suffer from high electrical noise. Provides all the tests required to complete the necessary electrical certification for industrial, commercial and domestic fixed wiring installations. Overlaying the non-trip loop impedance measurement is the 'Confidence Meter'. As loop impedance values can be dramatically affected by circuit noise, the Confidence Meter displays the degree of confidence in the accuracy of the measured loop impedance. Using the digital ARC to indicate the analytical process, the measurement is continually monitored and adjusted when circuit noise is present, resulting in a dramatically improved and repeatable test result.