Swarovski They are a little tricky to get accurate readings. I usually end up taking 8 or ten readings in front of and behind the target and if possible on he target. There is a little bit of voodoo involved but with practice you can get very very close even with that big circle. Others may be able to hold on an animal and get a perfect reading everytime, just my method. My only real complaint is that it is kinda hard to see that circle in bright light.