I seen a post last night regarding Alkalinity testers. I am just getting back in to the hobby after about a 10 year hiatus. Lots have changed since then. One of them seems to be the electronic hanna checkers. I ordered an Alkalinity one from BRS and mistakenly ordered a DKH instead of a PPM. I think PPM is what most people are referring to now correct? Did I order the wrong one by mistake?