Details

Is the spark plug the problem? CheckSpark™ Ignition Analyzer safely checks it in seconds
If you're not sure why your gas engine isn't working, simply clip the CheckSpark™ tester onto the spark plug wire of the non-running engine, big or small. Then firmly pull the recoil starter or energize the electric start long enough to turn the engine over several times. Watch the LED indicators: red means "no spark", green means "good spark," and yellow means "low spark" (a bad plug or wire). Automatic shut-off saves battery.

Diagnoses proper spark, fouled plugs, open or broken plug wires
No need to remove plug, wire or cap
Safely avoid that "jolt" from touching a bad plug wire
Ignition troubleshooting chart included

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About CheckSpark Spark Ignition Analyzer

Engine not starting? CheckSpark safely and hands free tests for proper spark, shorted / fouled plugs, and open or broken spark plug wires. The CheckSpark engine ignition analyzer is a highly accurate diagnostic sensor that uses micro circuit technology to troubleshoot why your car or gas powered items will not start. The easy clip on tool does not require you to remove the plug boot or spark plug, eliminating the chance of getting shocked.

Includes: CheckSpark Engine Ignition Analyzer, Detailed Instructions, Diagnostic Tag, One AAA Battery.
Battery: AAA alkaline battery included
Operating Temperature: 0-130 degrees F

Will work on four stroke, or two stroke engines. Works on pull start or electric start engine. Works on single or multiple cylinder engines.