Essentials pH Pen Digital Meter Tester Stick Nutrient Management
Simply dip the probe in the solution and press the CAL button until CAL appears onscreen. 0.0 to 14.0 pH. +/- 0.2 pH. Water Resistant. 170 x 32 x 15 mm. 4 x 1.5 V button Cell. Product Life. Auto Shut-off.