[Shop-talk] Portable inductive spark testers?

[Jim Franklin]

I'm looking to toss one in a basic troubleshooting kit for the moto. Some folks at garagejournal recommended the Lisle :

http://www.amazon.com/Lisle-19380-Spark-Tester/dp/B0002STS3U

But for < $10 I'm hesitant, since I'll likely be broken down on the road when I need this, and it had a few "cheap junk didn't work" reviews. Curious what y'all's experience is with them.

thanks,
jim