digital pool testing

I am a chemist and have been able to get my hands on one of these if I wanted. I know a lot of pool stores use one of these 2 or something similar, while I don't trust pool stores themselves the tech seems to make sense. It would seem to be a spectrometer that reads in the visible light range to...

Hey everyone, I'm looking for something digital that's accurate and can test as much as possible (mainly caring about free chlorine, total chlorine, ph, alkalinity, cyanuric acid, and calcium hardness). I have the hardest time with test strips and color matching. It's difficult knowing which...