This pH meter came with calibration powder and instructions on how to calibrate and use this meter. I love this thing, it's accurate and very easy to use. To test accuracy, upon receipt I ran it through vinegar, lemon juice, and milk, then made a batch of barbecue sauce. After that was done I checked my readings, recalibrated and re-measured, and tested a few different glasses a third time and each time they read in the 3.20 to 3.26 ph range. So it's very accurate. And for me it's worth its weight in gold.
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