This is a must have for electricians as well as homeowners. A non-contact voltage meter is a very quick way to identify live wires, and to narrow down electrical issues. Of course the safest method is to use a multi-meter before working on something, but this is a very handy tool to have. I have been using this tool for 5 years now on the original batteries and Fluke spared no expense when constructing a very high quality tool. Their meters are legendary in industry and very few brands compare to the same quality and consistency in their equipment.