So if I wanted to increase the character length to accept an extra couple of characters do you know which part of the code would I have to change? I just can't work out which part it actually is. In any case I'm a bit confused because the pH, being in the buffer solution stays at 3.99 but I get all sorts of strange characters even at the beginning character. Anyway hopefully the formatting will work as you say when I work out how to do it.