Description Testing insulation is essential to keeping wires and motors working properly. The analog insulation tester will measure the resistance in ohms and will display the results on a dial. It can also be used on the wire insulation, as well as cables and cords. The analog insulation tester is made up of a set of probes that are inserted into the insulation to test the insulation resistance. Single person push-button operation. High accuracy ±5% of indicated value in effective range. Meco insulation tester has a scale length is 80mm. Terminal voltage has >85% of rated voltage for insulation resistance. The measurement is from 10% to 100% of the insulation resistance range. ABS resin yellow case with polycarbonate meter front cover.