I've been using this for a year. The first probe broke right after 6 months warranty, the next 6 months had 3 failures! The third failed again a week after the warranty. I take good care of him. They act like it's your fault! Have I had better luck with Hanna's $35 Ph pen, some of which lasted over 6 months and their wired counterpart in this old style lasted me about 2 years? before the pH sensor failed. It keeps the calibration well while working. I don't buy anymore! good luck with oakton ph 2 for 4 months. good features too!
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