6.7ms nutrient solution - 816-070

Nutrient Tester Calibration Solution - A ready made 6.7mS 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.