HT Earth Meter M71.
This device allows for carrying out measurements
with a wide measuring range (50kohm) and an efficient internal automatic compensation of the disturbance effects found on the installations, and it is provided with an ergonomic design with an electronic function selector for quickly carrying out the tests. The 2-wire method allows carrying out earth measurement by taking advantage of appropriate external masses as a reference (metal surfaces, tubes, neutral conductor, etc.), which is particularly useful in private environments where, because of logistic problems, it is not possible to use the 3-wire method.