Compression testing

[Vsuffolk]

Forgive the very newby dumb question (first post!), but will a bog standard "buy it on Amazon UK" compression tester work with a 1990s chevy 350 5.7 engine, or is a US (imperial?) sized adapter required?

Thanks!

[shovelheadrob]

Spark plug threads are the same so yes.

[Vsuffolk]

Thanks! Just double checking

[Camaro]

Yes,

Spark plug threads are metric, so should definitely work.

Just be warned, cheap testers may give inferior results. Is this a leak down tester or a compression tester?

[Vsuffolk]

Thanks Camaro - as it happens, I've not gone with the vehicle I had in mind when posting, (would have needed to know for sure whether it needed new valve seals or a full rebuild), but I was wondering what is the difference - would be great to know for the future and for others who are new to big old V8s.

On the subject of testers, loads available for up to £30 or so - are they all as likely as each other to give inaccurate results?