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Nutrient Tester Calibration Solution - A ready made 2.8 mS standard solution that is suitable for calibrating your ETI Nutrient tester.
Easy to use - makes checking calibration simple.
Although your tester is calibrated when manufactured, it is recommended that you re-calibrate your HortiCare Nutrient Tester regularly to maintain the desired accuracy of the tester and deliver optimum, reliable results. Supplied in a 90 ml bottle.