Spark Plug Erosion Gauge

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Part# 12-03392
MFR Model# ATS482


During the course of normal operation, the electrodes of a spark plug will erode away and must be re-gapped as needed. But there comes a point at which the electrodes will have worn down too much, making the plug unserviceable. This simple go-no-go gauge makes it easy to determine if you plugs have reached the end of their useful life. Simply gap your plug per manufacturer's recommentation and then check to see if the electrodes fit through the hole of the gauge. If they enter the hole, then your plug is too worn and must be replaced. It's that simple.
California Prop 65 Warning Symbol

WARNING: The product may contain and/or expose you to a chemical(s) or substance(s) which are known to the State of California to cause cancer and/or birth defects or other reproductive harm. www.P65Warnings.ca.gov


  • Made of Nickel-Cadmium plated steel in the USA.
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Please note, Aircraft Spruce's personnel are not certified aircraft mechanics and can only provide general support and ideas, which should not be relied upon or implemented in lieu of consulting an A&P or other qualified technician. Aircraft Spruce assumes no responsibility or liability for any issue or problem which may arise from any repair, modification or other work done from this knowledge base. Any product eligibility information provided here is based on general application guides and we recommend always referring to your specific aircraft parts manual, the parts manufacturer or consulting with a qualified mechanic.

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