The screen reads:
DNA: 100% human
Gender: Male
You sit down in the alley and check out the features of the device, you open up a menu and find a database of countless animal species, you even manage to see samples of vegetables, bacteria and fungi.
You also read the instructions to scan new DNA, apparently all you need is to either provide a physical sample like you just did with your finger, or point a scanner located in the front of the device to organic matter. It's technology is extremely advanced, it can even pick up DNA traces from fossils and contaminated material.
Even though the device seems extremely advanced, it's shown information about your body that only you knew (or most of it at least), and has samples of over a million organisms, you still have your doubts, it's impossible for anything to change your DNA just like that, so you decide to test this device by changing your DNA into something else...