daughter is asking what I want for my bday. I have the allinonepump, Ph tester,etc. I don't have an acid tester or a refactometer.. I don't know if an acid tester is worth the trouble. No means to,turn an unused fridge into a storage facility, have plenty of car boys, etc. hence the refactometer. Any suggestions on a model or some other toy I haven't even thought of? I am thinking of the $50-150 range.