I have a hanna ph tester and would like to get the calibration liquid but was wondering if any will do or does it have to be specifically made for Hanna? thanks for any help in advance, just wanna get all ordered at same time
Does not matter who makes it. Get some 4.01 and some 7.01. I use alot of this stuff, so don't buy it in the packets, buy it in the big bottles (ebay).