Mount a small shelf on the wall at eyeball level right above your loading press. Put your balance beam scale on it. You will get an accurate read on the hash marks, and near the wall, it is not affected by air currents. You can also insure the shelf is clean from drill press/sander/saw/grinder grit by wiping it down before you set the scale down. Just make sure nothing else gets stored there.
I keep my scale there, covered up with a plastic cover and store the balance beam in another location. My second scale is an electronic one that I use only as a co--witness. It is placed on the loading bench top in a handy spot. It can be read at just about any angle.