spark plug, 14mm or 16mm

[bushbean]

There's a compression tester for sale from Harbor Freight. This tester is the sort that you screw into the spark plug hole. The box indicates this tester only works for spark plug holes with size 14mm or 18mm. Does the 3Geez has one of these two sizes? Thanks.

On sale right now for $5, brand new
http://www.harborfreight.com/cpi/ctaf/displayitem.taf?Itemnumber=92697

[StressSolutions]

Gosh, you know, that every car on the road today has either 14 mm or 18 mm sparker threads???

Yes, Honda has 14mm.

[bushbean]

I didn't know that. I had three different size spark plug wrench. One for my BMW, one for the 3Geez, and one for the lawn mower. So, I thought there is infinite number of sizes. Sorry for the noob question, but I hope somebody will find the answer useful someday beside my ignorant self.

[Estimated Prophet]

No such thing as a dumb question.