i have dealt with several brands over the years.
hanna suck i reckon.

eutech are the best brand ive come across that are affordable.
Imotep Reviewed by Imotep on . Testers for P/h and TDS/EC needed! I have 2 testers that im not satisfied with at all they are both hannahs and they are not doing the job I just got the EC/TDS/Temp tester and it worked well for about the first 6 times and now when i try to calibrate it I cant get it to work correctly and they sent me a different brand name calibration fluids!? Its Genesis and they have their own testers and i know that Hannah has its own cal fluids and im not getting my numbers correct and im dead in the middle of 12/12 and they are getting Rating: 5