getting weights - scales

Hi there. I have a question for those on peds units. Tell me about your standing scales that you use for weighing kids. When we admit kids, we have our standing scale that we move on wheels down the hall to the room they are admitted to and weigh them there when they get into their gown. I have always questioned the calibration of the scale and accuracy since it's moved around so much. Last noc, I weighed myself 4 different times and got 4 different weights. not just 1/2-1 lbs difference. I'm talking 6-8 lb difference. So tell me, when you admit you patient to the unit, is your scale right inside the door, do you bring it with you like we do, or something different. Pts that come from ER sometimes get weighed & sometimes not. Sometimes they just estimate, fully clothed, etc. So those weights aren't very reliable. Just trying to find the best way to do it here and I want ideas before I bring up the idea of change to my unit. Thanks!