Ruler Cm includes the following functions: length measurement, thread pitch determination, length calculation, straight line, unit converter (inches to millimeters, inches to centimeters), online ruler, vernier caliper, etc. mm ruler ( Roulette) is a beautiful, functional and easy to use tool for any smartphone or tablet. Ruler Cm advantages: - measurement accuracy; - ease of use; - measurement of length by any side of the device; - setting of units of measurement: centimeter, inch; - easy