This ph meter is handy, easy to use, inexpensive, and accurate. If you have fish tanks, using a pH meter is much easier and more accurate than using test drops or strips. The pH of my tap water varies and normally too high for my fish tanks. When I make weekly partial water changes on my tanks, I use this meter when adjusting the pH of water than I'm going to add to the tanks. By always adding water than is 7.0, I don't have to worry about the fish being shocked by large changes in pH. Being able to quickly and easily test the pH of a tank is a very handy as an indication problems with water quality. If the pH of a tanks shifts rapidly, it is an indication that something is wrong. Changes in pH also make it harder for fish to cope with other water problems such as Ammonia, Nitrites, or Nitrates. By checking the pH with this meter and the TDS with another, I can quickly check all of my tanks. If the values shift dramatically, then I know that I need to get out my test kit for test for all of the other stuff, and do a partial water change.
Unless you pay 10 times as much or more for a laboratory quality meter, all of these affordable pocket-pen metes like this one will need adjustment for drifts in the reading over time. I bought a kit at the link below with test solutions of known pH, which makes it easy to know if the meter needs adjustment occasionally This meter is easy to adjust with a screw on the back.
https://smile.amazon.com/gp/product/B0063MVU5S/ref=oh_aui_search_detailpage?ie=UTF8&psc=1
About once a month, I simply dip it into a solution of known pH, and adjust the screw slowly if needed until the display shows the correct pH. Other meters that say they are "auto-calibrating" are anything but automatic. They require you to have test solutions of 2 different pH, normally 4 and 6.86. Finding test solutions of the required pH is often difficult or requires messy mixing of exact amounts of powers and distilled water. The auto-correcting ones then require complicated procedures of pressing and holding buttons while you dip the meter in test solutions and clean the meter between in distilled water between each test solution. It is time consuming, messy, and confusing.
Simple meters like this one with an adjustment screw are much, much easier to test and adjust when needed. You simply dip it into a test solution of any known pH, and then adjust the screw if needed until the display shows the correct pH for that test solution. Adjusting one like this with a screw adjustment is no harder than moving the hands of a clock for day-light-savings time, while the "auto-calibrating" meters are more comparable to filing a long-form income tax return on paper without a calculator or PC.
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