Auto Ignition Coil Tester Tool MST-101 Spark Tester Pen Automotive Electronic Faults Detector

The quality and great use when working in my vehicles. It simplifies the work and the guessing of electrical problems .

This product takes two AAA batteries. Used it today to test the ignition coils on my car. The LED Flashed and the beeper responded to the magnetic field inside the coils. I am looking to use it more to better understand the variations in the led and or placing the tester in the best location. Used it on my alternator also and it worked great. The instructions are not the best but you can figure it out. Very happy with it.

Received it and opened it up. Installed batteries and laid on tool table. Hadn’t had a chance to get to project that needed it yet and I walk in there one day and it’s going crazy on the table beeping. Had to remove batteries. With any batteries installed it just beeps like crazy and won’t stop. Doesn’t matter if it’s in the off or on position. Annoying! Refund window closed!! Money wasted!!

Works great ,

The media could not be loaded. I bougth it for testing engines coils and it sometimos doesn’t work…

It has 2 settings but I have no idea what the difference is between them. It does work on ignition coils but you need to be in direct contact with it to get it to reliably trigger, it also triggers on some fuel injectors too. So far i cant say that its has replaced the oldschool way for checking for spark but i do see myself trying to use it first.

As long as you realize this thing doesn't check for voltage or any current and goes off changes in magnetic fields you will be happy with this purchase. I used this at work to see if a relay was working and I can tell that my coil packs on my car are firing. Great little product if you understand what your getting.

Tested the coil packs, injectors, alternator and everything with ease. Found that my misfire was not caused by any of these but a simple hose on my pcv valve. A very good investment in my opinion.