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 well. No complaints. Great at making some gaps

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

This is made in USA. Not sure what kind of metal it is, but odd that it has the CA prop 65. It's not dead-on accurate, but good enough for a daily driver, lawn mower, etc. Keep in mind that the gap increases as the plug wears anyway, so all you are doing is taking an initial reading. As an example, this gauge shows .042 on a plug that actually gaps at .045 with a calibrated wire. The error is does not make a difference with most vehicle systems. It is fairly easy and quick to use, but you still have to pay attention to the angle you hold it at, and be aware that ground electrodes can have a burr because they are shear cut. If you are really picky, use a single-ended wire gauge instead.

Works just like the old ones from years ago when you had to adjust the gap in spark plugs before replacing them on the car. Now, consumers cannot get to the spark plugs and plugs likely come pregapped for todays cars.

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

You should always check the gap on your spark plugs before installing even if they are new. Simple tool but very affective.

Good tool for the price! Mine came a little dirty but easy to clean measuring surface with brass wire brush. Did not break a tip while adjusting spark plug gap👌

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。