Klein Tools Insulation Resistance Tester

The ET600 megohmmeter tests insulation at 125V, 250V, 500V, and 1000V DC, and reads insulation resistance up to 4000 megohms. That covers the usual motor, feeder, and control-wiring megger checks where a 500V or 1000V test is specified, plus the lower 125V and 250V settings for low-voltage or electronics-sensitive circuits.

Yes. The ET600 carries a CAT IV 600V and CAT III 1000V safety rating, so it is rated for service entrance and utility connection work at 600V as well as distribution panels and feeders up to 1000V. Use only CAT III/CAT IV rated leads with it, and replace any lead that looks damaged.

For basic electrical troubleshooting, no. Beyond insulation testing, the ET600 measures up to 1000V AC/DC, resistance, and continuity with auto-ranging TRMS, on a 4000 count backlit LCD with bar graph, Max/Min, and Hold. What it does not do is current, so if you need amps you still need a clamp meter alongside it.

Leads are included. The kit ships with the tester, CAT III/CAT IV safety rated right angle test leads, heavy-duty alligator clip test leads, batteries, a carrying case, and the instruction manual. The alligator clips are what you want for insulation tests, since they free both hands while the lock button holds the test running.

No. Insulation resistance, resistance, and continuity tests must never be run on a live circuit with the ET600 - de-energize and isolate first. The meter does warn you if voltage is present: it sounds an alarm and shows a high voltage icon. Before each use, verify the meter by reading a known live voltage on the AC/DC volts function, then kill the power before switching to the megohm range.

That is what the lock button and stand are for. Clip the heavy-duty alligator leads on, press test, and lock it so the test voltage stays applied while you read or move. A built-in stand props the meter up, and an optional magnetic hanger lets you stick it to a panel or enclosure for hands-free work.

Yes. The ET600 is test-verified for conformity to EN61557-1, EN61557-2, and EN61557-4, which cover general requirements, insulation resistance, and continuity of protective conductors. That is the clause facility and institutional maintenance groups usually cite when specifying a megohmmeter for documented preventive maintenance testing.

Installation, troubleshooting, and preventive maintenance on electrical wiring and equipment. Typical use is proving new wiring and motor windings before energizing, chasing a nuisance ground fault, and scheduled megger readings on motors, transformers, and feeders in a maintenance program. The housing is ABS and polycarbonate in Klein's orange and black.