Very nice UI but the urine sampling and phone scanning are very rough. (1) A urine collection container in the shape of test card would be the way to go so that the user does not have to guess at the even distribution of urine splashing around the substrate while counting. A small ziplock back works better than holding it under a stream (2) the app's ability to read a card with a couple dozen reference points that are only a handful of pixels is really, really rough. It is difficult to line that up with perfect lighting, but consider that for most users "first thing in the morning" will likely mean it is dark out, therefor using indoor top-down lighting, of which the phone will cast a shadow. For the price and unused space in the box a jig should be included for reading samples. I created one out of a cardboad box and an $8 diffused LED ring light from Amazon. Ideally, the camera template shouldn't even be there and the backend of the app should check for consistent lighting and contrast on area of interest on the user-submitted image with either a "pass" or "try again" with tips/guidelines to obtain a better image. If this is not possible for a while, the jig is the way to go. I'd suggest something plastic (cardboard is still difficult with the current tolerances) but here are some photos of what I made: https://www.dropbox.com/sh/a3o82iuorqjgh5e/AAACD59-Fab-6UvkDJ_Kvk7va?dl=0