Triplett ET30 Non-Contact Magnetic Field Detector - AC/DC/Permanent

Works better than I expected it to for checking DC hydraulic solenoid valves. It is a little tight getting the cap off to swap batteries, but nothing you can't handle with a little flathead screwdriver. The light on this is useless though, but that's not what you're buying this for.

Excellent magnet detector it helps me to trouble shoot solenoids, for people who doesn’t know this is not a voltage detector.

mal muy mal solo funciono la linterna

Poor quality all around. Package a pain to open, battery compartment opening very difficult to figure out and, oh yeah, it does NOT detect any magnetic fields. Poor value, does not function, difficult to use. Flashlight works ok, but doesn't stay on unless you keep your finger on the button.

Very neat tool to have in your tool box. I recently just used it to see if my ignition coil was working. It was I had a bad spark plug. Awesome for diagnosis.