It uses a large LCD gray screen backlight display and microprocessor technology to meet the requirements of two-wire and three-wire test resistance Suitable for telecommunications, electricity, meteorology, computer rooms, oil fields, power distribution lines, iron tower transmission lines, gas stations, factory grounding networks, rods and so on. measurement range 0.01Ω ~ 3000Ω, grounding voltage range: 0 ~ 600V,with the value of maintaining and alarm tips and other functions.