Review on Lisle 19380 Spark Tester by Rusty Calcara

I had to invest in a spark tester to troubleshoot my pickup truck that would not start and this tool really helped me identify the problem. I also have a built in tester, but I've found this tool useful when I need to quickly switch between connector wires. My built in tester can only be used on one spark plug at a time without turning the ignition off. I thought I only needed one tester, but have since changed my mind because I think you need both. In my opinion, an indispensable tool that should be missing from the shirt pocket of every professional mechanic and whose price cannot be beat. Plus, it's made in the USA.