One tested three of these against the same standard calibration solutions, and got wildly different results . . . up to 1.0 pH units from the standard let alone to each other :shock: Our conclusion was that they are a complete and total waste of money
There is no such thing . . . Looking through the SLS Lab supplies catalogue there are some for around 90-100 quid, which compared to my bench meter is relatively expensive . . I don't have access to the book at the moment, but I can check when I get home.
