Home inspectors perform a wide range of tests. Troubleshooting of electrical circuits, wires, and breaker panels is a part of their daily job. They need many tools and often purchase electrical test kits which contain a wide selection of test instruments and tools.
A typical electrical test kit contains a clamp meter to test AC current and voltage, a digital multimeter for measuring current, voltage, and insulation resistance, and an IR non-contact thermometer for checking overheated breakers or detecting heating or AC cooling problems.
The sets of electrical testers and tools have their pros and cons. A main pro is better pricing, as instruments within a set are usually discounted, as well as you can get all instruments you need in a pouch or a case. When you already have some tools, you probably should opt for individual meters or tools.
Electricity should be tested before beginning any job. Security should be your main concern when electrical circuits may be live.
We highly recommend some major brands: Extech, Fluke, Greenlee and General Tools. Valuetesters.com is an authorized distributor of these manufacturers.