Review on 🔌 Analog Professional Compatible Arduino Raspberry: Enhancing Your Projects with Versatile Compatibility by Robert Prix

Looks good although there are a lot of Chinese stickers on the dipstick, box and instructions. This instrument must be calibrated several times a day to remain reasonably accurate. When working properly, the advertised accuracy of ±0.1ph seems to be what I'm getting. But after an hour or so (using the provided Arduino code) the readings are extremely inaccurate and useless. 4.9 and 6.1 back and forth, which is clearly utterly useless. The only solution I've found is to recalibrate the gauge (using 2-point calibration and Apera buffers), but that doesn't seem to take long before it fails again. Don't waste money, spend a little more and buy a probe from Atlas Scientific or another company with a quality guarantee. Also, you can buy the exact same meter for around $20 directly in China if you check out Chinese retailers.