I have a self calibrating hanging electronic scale which is very good for large weights - its the low ounces I can't currently measure. I've a small digital flat top scale for cooking - use it to portion hamburger, sausage, etc when I'm grinding and repacking, that sort of stuff, which is great for meausring birds till they exceed 3# or so - but the battery compartment door holds the battery in place - once it warps, ever so slightly... and then its a jenga game trying to put slips of paper in to hold the battery "just so" when the door gets closed.
Stupid question, but how do you keep the chicks on the scale?