Quote Originally Posted by analog what is that? View Post
How can you say that? Both measurements fall in roughly the same range; a couple of tenth's off which is insignificant is this context....

He could have done just as well with a 15$ chinese pH meter, and changed it every year, ikf one was afraid that the *unusual environment* would eventually do in the cheap meter.....

I don't think much was achieved here but demonstrating a tour-de-force that means nothing for the rest of us readers of this thread, this is supposed to be of value to rank amateurs and one need to have feet planted solidly on the ground.

Sorry, but I have spent years around appartus like this in my work life, running everyday tests IRL...............
With the exception of $ task-specific items, pH "test-strips" are a poor choice for any truly meaningful quantitative work. The investment in a quality meter will pay for itself by providing trustworthy accurate readings.