Southwire M550 Multi-Wire Circuit Tester
$25
A Southwire M550 circuit tester. Tests five different wire types — from 1.5mm² to 6.0mm². Fits in your hand, clips to your belt.
Good Tools circuit-tester electrical-tool southwire voltage-tester wire-tester
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We used this for a few home electrical projects — checking whether outlets were wired right, testing voltage before pulling old fixtures.
The plastic case has held up through rides in a tool bag. Green and red LEDs tell you what’s happening. One button does the test.