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Spark-plug access & clearance gauges

Check the exact plug size and measuring range.

GEARWRENCH 80601 product photograph

By TradeGear HQ editorial desk · Reviewed · Research methodology

Choose for the task

GEARWRENCH 80601 offers magnetic swivel access in 9/16 and 5/8-inch sizes. Lisle 68100 measures supported clearances with graduated blades. These do not form a universal engine-testing or ignition-service kit.

What to check before buying

The socket set does not supply 13/16-inch or exact 14 mm coverage, and 9/16 inch is not identical to 14 mm. The feeler set ends at 0.035 inch; a course or procedure requiring 0.040 inch needs further coverage.

Compare the verified functions and buying considerations
ToolKey detailsBuying consideration
GEARWRENCH 8060180601 five-piece magnetic swivel spark-plug socket setFive pieces · 3/8-inch driveDoes not cover 13/16-inch or 14 mm school/vehicle needs. 9/16 inch is not an exact 14 mm substitute. Do not claim a complete ignition-service kit.
Lisle 6810068100 deluxe feeler gauge31 blades including one 0.010-inch brass blade · Thickness range 0.0015–0.035 inchCheck the full blade range against your course or vehicle requirements. This is a conventional feeler-gauge set rather than the 68150 go/no-go model; it does not extend to 0.040 inch.

Spark-plug access & clearance gauges

Sources & research method

Specifications and package details were checked against manufacturer documentation and Amazon.com listings. We have not measured performance or durability. Current price, stock and seller terms come from the selected retailer.

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Manufacturer research, not hands-on testing. As an Amazon Associate, we earn from qualifying purchases.