Contains 250 ml

If you want to improve your PH Tester product’s accuracy and longevity, you’ll need to get into the habit of regular cleaning and calibration.  

Luckily, the easy-to-follow calibration process is the same for all pH meters and pens.  

After cleaning your pH probe, you’ll 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.

You’ll need to recalibrate whenever you clean your pH probe and when your meter alerts you that a calibration is needed.