Review on Apera Instruments SX620 pH Pen Tester Kit: Accurate Results with 0.01 pH Accuracy, 3-Point Auto Calibration, and ATC by Justin Herman

I have absolutely no idea how I lived without this pH meter. I just used older tech or the cheap yellow gauges you see everywhere (which is sometimes good for telling the difference between lemon juice and drain cleaner). I knew this one would be better, but I didn't know how much better. Wow. I see a change in pH when I add 1 µL of acid or base. I no longer have to stick a stupid yellow pen or giant 1980's pH meter into a solution, go for coffee, add a reagent, drink more coffee, see if the reading has changed, drink more coffee, the meter Read off and compensate for the temperature using a spreadsheet or calculator. I've never had much faith in digital pH meters and have usually titrated, or at least double checked, with litmus paper. This gauge works perfectly and I have no idea how I lived without it. Although I've only used the +/- 0.01% version I'd say it's worth the extra $20 if you need accuracy. This model is small and may not be as strong as the larger models, but is suitable for test tubes and fits in a burette clamp on a lab bench. Very good. If I ever need ORP, salinity or any other meter I will definitely use Apera again.