Review on 🟡 Alysontech Digital pH Meter: High-Precision Pocket Water Quality Tester (Yellow) by Alfonso Tipton

The biggest complaint is the incomplete calibration information in the user manual, which took me hours to learn about pH meters. and vice versa. It turns out it doesn't really matter, as the calibration process automatically determines which calibration buffer you use based on its pH. The order of the calibration solutions used is irrelevant. Rinse the probe tip in distilled water between calibration solutions for maximum accuracy. Also, I've gone insane trying to measure the pH of distilled water - I'll never get a stable reading of 7.0. It turns out that you can't measure the pH of distilled water because it doesn't contain hydrogen ions. The same applies to deionized water and reverse osmosis water - the concentration of hydrogen ions is also too low, which means that the meter never gives a stable reading. I get fast and accurate readings for liquids that actually contain ions - pretty much anything but pure water. I recommend preparing the sensor tip by soaking it in distilled water for 15 minutes before calibrating - this should wet the tip and ensure it is working properly before eating the only packets of calibration buffer powder that come with the instrument. Meter. Another issue is that they don't provide a storage solution to keep the sensor fresh and accurate. If you do not use a storage solution, the meter's accuracy will degrade rapidly as the sensor ages. It needs to stay wet in solution with the right concentration of hydrogen ions. The manufacturer does not specify which storage solution should be used, and it depends on the chemistry of the probe. So, I think they are telling me that this meter is for single use only and for short term use and then I should buy another one. Also, cap the sensor when not in use to keep it from drying out. You can dip the tip in distilled water every few days to keep it wet - a storage solution would be better, but hey, what do you want for $13? give. Some meters allow adjustment to other standards readily available in the home (e.g. baking soda = 8.3pH), but not this one. FYI: Buffer powder 9.18 pH is borax, so you can easily buy it at the grocery store. Be prepared to buy additional packs of 4.0 and 6.86 pH buffer powder if you ever need to recalibrate the meter - these are available direct from ebay at a lower price. from China if you don't mind waiting a month for delivery. There are many videos on YouTube explaining how pH meters work - I think I've seen them all. Read this webpage to avoid the most common user mistakes: https://blog.hannainst.com/top-10-errors-in-ph-measurement The biggest problem mentioned here is not using your meter with deionized or distilled water store . Keep the tip wet - it will destroy it.