The model 307A insulation tester is intended primarily for periodic testing of industrial motors, transformers, electrical wiring, and cable insulation for signs of deterioration. Low readings may indicate impending failure allowing for permit replacement of suspect component during routine maintenance rather than risking component failure. It is also useful for safety testing of TV sets and appliances to assure no hazardous leakage current. The voltage and resistance ratings for insulation testing are often specified for the product to be tested.

Test insulation to 400Mohms

Selectable 250V, 500V, or 1000V insulation test

Low ohm resistance test ranges 500ohm & 3ohm

200mA Short circuit test

Extra rugged integral carrying case

Locking switch for extended testing

Live circuit indicator warns of safety hazard

Volt meter to 600Vac

Battery test feature

Overload protection