With PPM Pen, pH Pen, pH Probe, KCI Storage Solution, and Calibration Solutions (4.0 pH and 7.0 pH). Pens are waterproof and have one button push calibration.
With PPM Pen, pH Pen, pH Probe, KCI Storage Solution, and Calibration Solutions (4.0 pH and 7.0 pH). Pens are waterproof and have one button push calibration.