Thexton 404 Adjustable Ignition Spark Tester

* Works on ignition systems from high energy electronic automotive systems to small engines
* Tests for no start conditions and for spark strength
* Adjustable gap allows for spark gap requirements from 0 to 40,000 volts
* Gauge background makes spark easy to see for accurate measurement
* Alligator clip securely fastens to ground
* Screw assembly adjusts spark gap quickly and easily
* Safety shield