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We are testing a pH meter, or pH acidity meter. A cheap product bought on Allegro, price 80 PLN, but you can get it for 40 or less on Chinese portals. I will not provide a link to purchase here - if anyone is interested, the video shows the PH-98103 model, but I recommend another model, the one I ordered (unfortunately, I received a different product than the one I ordered), i.e. the PH-98108 model with a pointed electrode, which, in addition to measurements such as those in the video, allows the measurement of semi-solid and semi-liquid materials such as cheese, butter, dough, etc. Calibration and storage fluids (none of the names are either partnered or sponsored - these were recommended to me by the seller) pH 7.00 calibration fluid - AquaMaster Tools buffer solution 100ml pH 7.00 pH 4.01 calibration fluid - AquaMaster Tools buffer solution 100ml pH 4.01 Electrode cleaning fluid - AquaMaster Tools General Cleaning Solution 100ml Cleaner D Electrode storage fluid - AquaMaster Tools pH/ORP Bewaarvioeistof 100ml KCL 3mol/l 00:00 - introduction 01:47 - repacking and discussion, calibration fluids and what else I bought 05:27 - calibration of the pH meter 10:18 - measurement of pH of a 3-molar KCL solution 11:39 - measurement of pH of well water 13:08 - measurement of pH of 10% spirit vinegar 14:00 - measurement of pH of baking soda solution 14:23 - measurement of pH of demineralized water 15:29 - re-measurement of pH of calibration fluids pH 7.0 and pH 4.01 - checking the quality of measurements 18:00 - summary and conclusion