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Smart SM100 PH meter
This unit comes with probes to test your water for acid/alkaline values, (but also can be used for most liquids), and also a 20ml satchet of calibration solution. Or if the unit is to be used often, purchase an extra container ( 185 ml ) of the solution for $7.50. As an example, if the unit is used daily, clean and recalibrate the unit (couple of minutes only) each week, you will then continue to get accurate readings.