I struggled to find an intuitive and well designed White Balance Kevin Meter. Either they didn’t work, wouldn’t scale properly for my screen size or lacked a camera preview window, to be 100% sure if what readings I was really taking. (What was the camera actually aimed at?). This app checks all the boxes of elegant, fast, scalable, accurate and highly intuitive. The only challenge I had was not fully understanding the need to use a piece of paper to sample the reflected light from - and came to see that using a piece of paper either as a diffuser (hold over lens) or as a reflective surface to be used with one’s light source, balances out the readings very nicely. I’m not a Photographer, but wanted to measure the Light Temperature of some very obnoxious Street Lights which are well over 5,000 Kelvin - far above the AMA’s guideline of them being under 3,000 Kelvin (even lower is better 2,200 to 2,700 even).The Developer couldn’t be better. Super kind, responsive and skilled. Very satisfied and highly recommend this effective and elegant app!