I hope that this is in the right place. I have a Jiffy-Way egg scale that I bought on E-bay. I remember using one as a kid and wanted one now that I have chickens. It didn't have instructions with it and because I was a kid when last I used one, I'm not sure what some of the info on the scale is. I understand all but the "leveling device" line with an arrow pointing to it. Can anyone help? Thanks so much!