I had just received a new rcbs charge master supreme. Rcbs is not open till Monday and wanting to use it now! It will not calibrate, it says error every time!!! It has been on for hours and my old one works next to it which is sold! When just putting weights on the scale, they are 8 grams off, but it is dead on in grains weighting weights and matches my old one! Have also move it around the house and used different outlets and same results!