Since it's used you want to pick up a bottle of calibration solution ($12). I mean that's a good pH tester but it can be had for 60 bucks new. How used is used? Poor handling and or storage of pH meters can lead to probe defects pretty easily to be honest. You'd be better off paying < $30 used or buying a new one for $60+shipping. Good tester though I borrowed a buddy's when I was waiting for a new one to come in. Only used it for a couple of weeks but it was reliable and didn't lose calibration in that short window of time.
Thanks Goodie! Not sure how long it's been used for. The person told me that it's been in solution but it's in working order. But you're right for an extra $20 I can buy a brand new one.
Thanks
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