Many factors can affect cover measurement. These include neighbor bars parallel to the bar being measured, setting of bar diameter during cover measurement, scan location
relative to secondary bars under the bar being measured, different measurement probes (deep or shallow) or different probe settings (low or high range for covermeters using universal probe) etc. These factors will be discussed in this paper. Other factors such as magnetic effects from the aggregate or matrix of the concrete, variations in the properties of the steel,cross-sectional shape of bars and rib height, roughness of the surface can also influence cover measurement. However, these factors are insignificant compared to former factors and are not discussed here. Only limited research on covermeter accuracy is available.