Ease of use, as a colourblind person reading 'colours' is at best a lottery for me. Walking around and asking family members always end up in slightly different answers!
I can appreciate anything that can help remove the guesswork and estimation of water parameter testing as compared to color matching and counting. I would like to get my hands on at least the Calcium, Magnesium and Alkalinity Checkers sometime. <*}}}><
Small easy to use quick accurate results for easier dosing of alkalinity in my reef aquarium. Takes like 45 seconds to test and no guessing on what the dkh is because the color is close to the next number up or down.