Screw computerized testing - if the program is wrong or the machine isn't calibrated - you'll get the wrong information.
See my post on "PH Keeps dropping", it is info out of the Taylor book.
You need to know the starting water to be able to adjust anything ... if you even need to anjust anything.
People use test strips, I prefer the Taylor kit and either way do your own testing and adjusting - it's easy, can be way more accurate and it's FUN (OK not actually fun)
Post some numbers and we'll help you out.