0.2 / 0.5MM , you can choose the detail size feeler gauge which more suitable for your use.small size and light weight , there is a strip on handle so that carry it conveniently This feeler gauge can be used to measure for widths , and also flatness deviation Designed with a vernier which can help you to read the measuring result easily , it is a great tool in your engineering inspection project This vernier feeler gauge can be used for house inspection , engineering inspection , home and professional use In order to measure flatness deviation , you will need to use it with a ruler, Manufacturer: Watreketal