A 16"x24" framing square is far better than the Sticky Yard and just as good and a whole hell of a lot cheaper than electronic devices. Just tape a framing square onto whatever it is you're measuring and take a picture of the subject including the framing square. Now you have an image with a rectangle of know size. Bring the image into whatever software you're using, place a rectangle around the framing square, map the image into that rectangle, resize the rectangle to 16"x24", and un-map the image. Now you have a full size image that's as close to being correct as you're likely to get.
I seldom, if ever, measure any reasonably flat surface anymore. Vehicles, windows, walls, whatever. I just use my trusty framing square. The result is always within a small fraction of an inch of actual size. Severely curved surfaces get a paper template but that's a bit different process.
