Bought this meter in March 2014, thought it was cat meows at the time. Now, 18 months later, it's just junk. It can no longer be calibrated, it does not read any of the test solutions. Store in suitable storage solution when not in use. Hitting the Temp/Cal button gives you a pH of 4.4 and an outside temp that's slightly different, but close enough not to complain. I changed the batteries, I thought they might be. But no change in how it works, or should I say doesn't work. My biggest disappointment with this meter was that I thought it would last me years with little use. I want to correct this review. Well, I was going to wrap this up today and send it back with a nasty note. I'm glad I didn't. I took out the original packaging and re-read the assembly instructions for the first time. Decided to try it before sending it back. I'm glad I did as there was nothing wrong with that counter other than the operator. After following the instructions, the meter came back to life and is working perfectly. So that's it if it worked and now not trying to follow the manufacturer's instructions. I'll admit I'm feeling a bit silly right now, but I felt like I discredited her.
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