Concrete cover can be measured using commercially available covermeters, such as Proceq Profometer 5+,Elcometer 331 (formally Protovale CoverMaster), Micro Covermeter etc. However, many factors can affect the accuracy of cover measurement. The assessment of concrete cover for such important concrete structures should be only based on accurate measurement results by professionals. In order to understand some common factors affecting cover measurement,BCRC carried out an in-house study in 2008.