For a small over or under load of a few counts, this could be corrected by using the Tare button (Zero) on the display. Rectify this by taking off the load and pressing down the Tare button to reset it to zero. However, if the zero figure is significantly different, this could be a sign of a mechanical overload. A severe overload would result in permanent deformation of the strain gauges and would need to be sent back to the supplier to repair. Please see our repairs services page.