Digital Pen-Type pH Meter - pH Tester
Simple low cost PH meter. Perfect for hydroponic hobbyists. This PH meter is the same as what many are selling on Amazon but purchasing from Astral Grow you get our satisfaction guarantee and in store warranty.
6 month in store warranty
Manually calibrate by mixing calibration powder with distilled water then turning the small small screw with the included screw driver until reading is accurate. Calibration is recommended before using.