The Champ pH Meter is an inexpensive way to get accurate digital readings of the pH of your nutrient solutions. It has a simple to use manual screw to adjust and calibrate the pen. It has a range of 0 to 14 on the pH scale and an accuracy of +/- .2. The batteries are included with the pen, plus a screwdriver for calibration. In case of bad readings of pH even after calibration you can reset the calibration junction by pulling out 2 mm (1/8") of the cloth junction next to the pH probe. You can do this up to 20 times. The pen is not waterproof.

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