Essentials pH Pen
Essentials pH Meters are used for measuring the pH value of your nutrient solution. These handy meters are very easy to use simply turn on the unit and dip the probe in your nutrient tank, the digital display will then tell you your ph level.
To calibrate the Essentials pH Meter you will need a bottle of Buffer 7 (the meter comes with a small sachet). Then simply dip the meter into the buffer 7 and hold the calibrate button until it says CAL, the Essentials pH Meter will then recalibrate the device.