Pack-1 Car Ignition Test Pen, Engine Indicator Ignition System Spark Plug Coil Diagnostic Tool, Pen Type High Voltage Line Cylinder Line Spark Plug Tester, Uniersal for Cars (Silver & Purple)

* Overall Impression:-This is a good value for a simple to use, good quality spark plug and ignition tester.* Pros-what I liked and what worked well:-Good value for the quality and test function.-Well made and finished, it’s nice and looks like it’s good quality.-Simple and easy to use.-Doesn’t require batteries, charging or a power source on the tester to use.-Small, compact and portable. Easy to carry or store. (Not much bigger than an ink pen or small pen light.)-Size: 4.72 inches long by 0.39 inches.-Has a clip on it to put in a pocket, like an ink pen has.-You don’t have to disassemble to test.-It has an inner bulb that lights up to show functionality of the area tested.* Cons-what I didn’t like and what didn’t work well:-No storage or carrying case or pouch included, you’ll need to provide your own.-No instructions for use included with it. You’ll have to know where and how to use it.* Tips & Thoughts:-No use instructions come with it, you may want to refer to, print or save the listing details and pictures as there are some instructions for use there.

This pen is an electrical induction voltage tester. This is a simple device to check to see if the spark plug wire is providing an electrical spark plug. Just place the grooved end along the coil wire going to the spark plug and if the light illuminates you have a good electrical signal but this does not tell you if the spark plug is good!