М71 is a compact grounding resistance tester. It is designed for measuring grounding resistance with 2- and 3-wire methods using the volt-ampere method in accordance with IEC/EN 61557-1. This device allows measurements over a wide range (50 kΩ) with effective internal automatic interference compensation for disturbances detected on installations, and features an ergonomic design with an electronic function switch for quick testing. The 2-wire method enables grounding measurements using appropriate external grounds as references (metal surfaces, pipes, neutral conductors, etc.), which is especially useful in private premises where logistical issues prevent the use of the 3-wire method.