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Bluelab pH 4.0 Calibration Solution Size:250 ml Rate GPH: 0If you want to improve your pH products accuracy and longevity, youll need to get into the habit of regular cleaning and calibration. Luckily, the easy to follow calibration process is the same for all Bluelab pH meters and pens. After cleaning your pH probe, youll need to calibrate it with pH calibration solutions at two reference standards 4. 0 and 7. 0 pH. Once calibrated, you can start measuring pH again immediately. Youll need to recalibrate
