Toolso PH Tester Chlorine Level Meter Water Tester 1.5V AA Batteries Plastic Shell Swimming Pool Spa Water Quality Monitor

I gave it a chance sometimes it would work good then sometimes it was way off. Each use you have to rough up tip with sand paper they give you or reading does not read correctly at all. I stick to drops

Could not get it to register proper levels, and yes i checked it against my own readings and also my local pool store chemical testing