You read the title correctly. I’ve added a fingerprint reader to my Surface 3. (And you can do this with any Windows 10 device that has a USB port). Windows Hello is a wonderful feature that provides an extra level of protection from prying eyes while traveling. While I’m not necessarily paranoid, I don’t want strangers seeing my password or PIN while I’m lunching and computing. I feel more secure.
While you can purchase a typecover for the Surface Pro 4 (that also works with Surface Pro 3, but this combo has some power management issues), there is no similar option to purchase a typecover with a fingerprint reader for a Surface 3.
Luckily, there’s a way to do this (if you don’t mind using the single USB port on the Surface 3 and tying it up at least while you log in; you can remove and attach this peripheral while Windows is running so for me it is no big deal).
Amazon sells this super tiny add-on fingerprint reader from “Eikon” at a good price. It’s made by Authentech, who made many of the built in fingerprint readers for nearly all the big computer vendors (they were purchased by Apple in 2012).