Equipment review: Apera pH 20 pH meter

This one has a cute feature: When you reach the pH measurement you want or when it’s done measuring, it gives you a little smiley face.  This pH meter has a glass electrode. It measures temperature – 0˚C to 50˚C, +/- 0.5˚C – and has automatic temperature compensation (ATC). It measures pH 0 to 14, but…

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