This device was made to help you with your horse breeding activities :D Left-Clicking a horse with it will print the stats of that horse on the screen. You'll be able to read how fast it is, how high it jumps and everything! Perfect for finding the best breed of horse!
It will look like this:
But beware! Horses don't like being analysed. It hurts them every time you do it, so use it with care :3