Accurately measure seat posts head tubes bearings spoke diameters and just about anything else you can think ofthe dc 1 is a precision made instrument built with stainless steel mechanisms and a rugged abs composite bodyan indispensable shop tool able to measure in inch fractions as well as metric and decimal standardfeatures includelarge lcd displaydisplay in metric decimal standard and fractional standard to 1128 inchmeasures external internal depth and stepped dimensionsresolution 001