Klein Tools Insulation Resistance Tester ET600

Klein Tools Insulation Resistance Tester ET600 Review

The Klein Tools Insulation Resistance Tester ET600 is a very popular product among home owners and contractors alike. Its price tag makes it quite expensive compared to other brands, but its performance is well worth the money. It’s not just any old resistance test tool though; it’s designed specifically for testing insulating materials such as wood, fiberglass and even metal.

It’s also got a few features that make it stand out from the crowd:

Its power supply is built into the body of the tool, so there are no external wires or batteries to run. That means less weight and better balance. You don’t need to carry around extra batteries either; they’re included with every kit.

The ET600 comes with two different probes, one for measuring electrical conductivity (EMI) and another for measuring resistance (R). These probes have a range of up to 200 ohms.

You can use the ET600 with bare wire, plastic tubing, copper pipe and even aluminum foil. There’s nothing stopping you from using it with other types of insulating material too!

There are two ways to connect the ET600 probe to your circuit board: through a standard solder connection or through a special connector made for the purpose. The connectors come in various sizes and styles.

Some other popular features of the tool are its easy-to-see backlit display and its long battery life.

You can choose from a wide selection of optional accessories for your ET600, including an anti-static wrist strap, carrying case, probe sets, test leads and more. All of these are available on the official website.

Insulation Resistance Tester ET600

This tool was built to be used by electricians, HVAC technicians, maintenance workers and other professionals in similar fields. It’s a professional-grade tool that can test a wide range of materials. That doesn’t mean you won’t be able to use it in your own home though.

Klein Tools Insulation Resistance Tester ET600 - Picture

Homeowners can benefit from the ET600 too; it’s just a matter of knowing how.

The big issue is that the tool isn’t cheap. The manufacturer recommends it for professionals and they market all their extra accessories to them as well. If you’re a homeowner with no electrical training, it might be difficult to justify spending $500 on a single tool, let alone $1000 if you need to buy extra accessories as well.

Fortunately, there are cheaper alternatives that can do most of what the ET600 can do. There’s no need to spend that much if you don’t have that much to spend. If you are unsure, then it’s better to start out by testing your electrical wiring with a lower cost tool before moving on to something like the ET600.

The D-TEC DMR-EZ is a lower cost alternative that can still do everything most homeowners need it to.

Here’s a quick list of pros and cons for the ET600:


Very accurate. There’s no need to read a separate digital multimeter (you don’t even need to be able to read the LCD display on the tool itself).

Easy to use. It only has one setting, which greatly simplifies things.

Can test live wires without having to de-energize the circuit first or putting yourself in danger.

Can test through plastic, metal and even wood. The tool doesn’t need to make contact with the material you are testing.

Klein Tools Insulation Resistance Tester ET600 - realmanguide.net

Great battery life. You can fully charge it up and still get hundreds of tests out of it before you need to recharge. You won’t have to worry about the battery going dead in the middle of testing a live wire (although you always need to be careful).


A bit expensive. If you need to test a lot of wires or you expect to be doing a lot of electrical work in the future then the ET600 might pay for itself over time. If not, there are cheaper alternatives such as the D-TEC DMR-EZ that can do all the same testing.

May be difficult to find in stores. It’s sold online mostly and you may not have much luck looking for it at your local hardware store.

That just about covers it. If you have any questions or concerns, please let me know and I’ll get back to you as soon as I can.

Thank you for choosing the right tool for the job!


Stacy Siders

Sources & references used in this article: