Review on 📈 High Accuracy Digital pH Meter with ATC Tester - 3 in 1 Pen Type for Water, Wine, Spas, Aquariums - 0.01 pH Resolution, TDS & Temp Measurement by Danae Velasco

Great little counter. Works well for PH and TDS measurement. Although a couple of points. The backlight only lasts about 30 seconds. After that it turns off. It would be nice if it just stayed on until you turn it off. The TDS can also be calibrated, but you need a 1413 us/pm calibration solution. You then need to hold down the calibration button for a few seconds and then hold it down again and you will see the calibration numbers start to go down. Once you hit 1413, release the button to calibrate it. If this process were simpler, it would be ideal.