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This can not be calibrated as it say's on the back of tester and as it states in the instructions. There is no adjusting screw in the hole on the back that say's "calibrate with NaCI" and did not come with black case as shown in picture. I have bought 3 of these now before realising they can't be calibrated and the first one I bought is out by 10 ppm compared to the other 2.
Verified purchase: Yes | Condition: New
A simple value for money check of your drinking water quality.
Verified purchase: Yes | Condition: New
i put hot water through my reverse osmosis water purifier by accident so this was very helpful to check it was still working. Gave one ot a friend who is very concerned about water purity.
Verified purchase: Yes | Condition: New
Verified purchase: Yes | Condition: New
Useful product for travelling and convenient
Verified purchase: Yes | Condition: New