This is my second meter from 7Pros. The first was a few years ago and I still use it today. I find manual calibration much easier and more reliable. It comes with 4 bags of calibration powder, which is very easy to calibrate and accurate. The reading tends to stabilize after about 4 seconds. I use it to adjust the pH of the water for my plants. Everything you need is in the box including batteries and a great water test kit.
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