My scale is changing its "zero" by 1-4 tenths. I always turn the ceiling fan off and turn the Ac off while weighing . I realize that as the temp climbs a few degrees the scale will read differently. I always calibrate the scale at the beginning after warm up. My constant is 143.3 but it will change as much as 143.1-143.5 is there a better more consistent beam scale to use? This is aggravating during load development as 1/10 matters. Thanks