T-3720 earth clamp resistance tester is a ground resistance measurement instrument. It uses a new generation of LCD black screen backlight display and microprocessor technology. Ω+A synchronously displays the grounding resistance by induction. It does not need to measure the grounding system in the loop. It is safe and fast to disconnect the earthing lead off line without auxiliary electrodes. It is widely used in telecommunications, electric power, meteorology, engine room, oil field, power distribution line, tower transmission line, gas station, factory grounding grid, lightning rod and so on. The instrument has the characteristics of accurate, fast, simple, stable and reliable.