Use this super ruler for your measurements! It simple and useful! This included centimiters and inches scales (use the Units button). With micrometer you get very accuracy measurement. You can calibrate it any time.
Precision is 0.1 - 0.2 mm depending device and your measurement practice.
Tags: digital ruler , mm ruler , millimeter ruler , ruler mm , 2 mm ruler , partometer apk , digital ruler mm , 4 mm on a ruler , 4 millimeters ruler