Feature: 1. Earth resistance tester, in the measurement of a grounding system with loop current, does not require breaking down the grounding wire, and no need auxiliary electrode. 2. With large LCD display screen, clear data, easy to read. Can test ground resistance and loop resistance test. It is safe, fast and simple in use. 3. Widely used in the grounding resistance measurement of the power, telecommunications, meteorology, oilfield, construction and the industrial and electrical equipment. 4. Increase sound and light alarm function, with "beep?beep beep" alarm sound and increase the interference signal recognition indicator function, with "beep?beep?beep" indicator. 5. Earth resistance tester can measure the integrated value of the grounding body resistance and the grounding lead resistance. Specification: Item Type: Earth Resistance Tester Material: ABS Color: As shown in the picture Function Ground resistance test, loop resistance test Power Supply 4x1.5V AA dry battery (not included) Resistance range 0.01-1200�� Resistance resolution 0.001�� Data storage 99 groups Alarm threshold setting range Resistance: 1-199�� Sound-light alarm "Beep--beep--beep--" alarm sound, the alarm symbols flashes, press the AL button to turn on, off, and set Interference signal recognition function ��Beep--beep--beep--" prompt sound, NOISE symbols flashes Working temperature and humidity -20��,-55��, 10%RH - 90% RH LCD 4-digit LCD digital display, length and width 47x28.5mm / 1.9x1.1in Jaw size 65x32mm / 2.6x1.3in Meter size 286x87x56mm / 11.3x3.4x2.2in(L x W x T) Guard class Double insulation Structure Clamp CT Shift Automatic shift External magnetic field