CTA Tools 3235 Spark Plug Gapper: Coin-Style Spark Plug Gap Tool, 0.020"–0.100" Measurement Range, Plated Steel, Quick-Check Reference Tool

While you can certainly use small calipers to measure spark plug gaps, this tool is an effective, inexpensive way to get the job done - plus you don’t need any battery/power. It seems like every time I go to use my caliper I need a battery lol. You just insert the gap tip in the hole and you can turn the plate until you determine you are at the right gap.

Works like it should and easy to use

Tool is small and easy to lose so be careful. Did not check for accuracy. Used to ensure all sparkplus set to same gap.

Decent quality and works as expected

Works well. No complaints. Great at making some gaps

I like it. Previously I've used the wire loop style. Someone may argue that system is better for whatever reason - fine. I decided to try this coin- style and I like it. Really easy to use and adjust the gap.

best bottle opener I’ve ever had. Thing even fits on my keys for when I’m out drinking and drivin…

Nice tool. Very easy to see and read compared to most.

Very good item quality/ measure

As described

Temos a escala principal em frações de polegadas e no verso em milimetros. Desta forma para verificarmos ou ajustamos a folga do eletrodo no padrão metrico devemos utilizar a escala estampada no verso, o que não chega a ser nenhum transtorno, só uma questão de acostumar com o uso do produto. Todavia como se trata de um produto comercializado em um país que adota o sistema métrico, as escalas deveriam estar invertidas.

Nice quality tool with smooth finish and clear markings

ちょっと値段も高いので… もっとリーズナブルな商品を買ったほうが良いかと思います。