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Vantakool Digital PH Meter – Dirt cheap but gets the job done. Comes with powder packets that can be used to calibrate the pen.Auto Calibration: The VANTAKOOL PH meter has an auto temprature compensation feature that adjusts to water temperatures and water quality to give pH readings It keeps automatically trying to calibrate the ~4pH solution as the ~6.8pH calibration point. And yes, I checked the low pH solution with a test kit and it is VANTAKOOL Digital PH Meter, PH Meter - 0.01 PH High Accuracy Water Quality Tester with 0-14 PH Measurement Range for Household Drinking, Pool and Aquarium CT-6021A Pen pH Meter Instruction Manual Pen type digital pH meter, all in one, pH electrode is Auto calibration for pH 4.0, pH 6.8 and pH 9.1.