Well how do we know that any scale at all is right?
My lab has weights that get calibrated against a NIST standard annually. We use those weights to perform daily quality control that our scale is accurate (to +/- 0.01g). If the quality control fails then we recalibrate the scale.
TX had similar bullshit (nothing until 11) when I was there working overnights. It’s my 8pm. I’ve been up keeping patients alive all night. Make my drink.