I was at the lfs today and they used a "refractormeter" or something like that to test the salt level in my water. Not sure what he called, but something like that. What is the proper name for it?
As well - they had a water PH meter that tests it digitally - what is the proper name for that?
As well - they had a water PH meter that tests it digitally - what is the proper name for that?