OP
Spudnik
what exactly does it mean when a tester is advertised as being 17th edition??
i take it the older models are still perfectly ok to use, or as i've just qualified to 17th and its my first tester i'm buying, should i go for a '17th edition tester'?
Its just a marketing phrase.
All testers old and new are suitable, providing they carry out the tests listed in gn3