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Length of non-accessible objects is measured indirectly. Length of accessible objects can be measured directly using a metre scale, vernier callipers, micrometre screw gauge, measuring tapes, travelling microscopes etc. Other practical units of measurement of length are micrometre (mm), millimetre (mm), kilometre (km), Angstrom (A°) etc. The length is a fundamental quantity, it is used to measure a distance between two points in space. Inch was divided into three parts called barley. In scientific and engineering terminology, a device to measure linear distance and create proportional linear measurements is. For an on-screen image, measure the known dimension of an object in the image (eg: a wheel diameter) If 100 measured from the plan or image represents 10000 actual length, the scale 1 : 100. The length of an inch was originally decided by Edward-II of England in the early 1300s as the length of three grains of barley laid end to end. A scale ruler is a tool for measuring lengths and transferring measurements at a fixed ratio of length two common examples are an architect's scale and engineer's scale. As hobbyists and engineers alike will confirm, precision is key to getting a project done perfectly. Take a measurement from plan or on-screen image and enter it and the actual length it represents to calculate the scale. To measure lengths units used were a finger, palm, span, cubit, foot, yard, fathom, furlong etc. 1) Double sided ruler in centimeters 2) an asimmetric one but with a 90 degree angle 3) the same ruler as (1) with a logarithmic scale. When the measurement must be done through a formula or other calculations, the measurement is called indirect measurement. Measurement of the length of a table by metre scale. accepts no responsibility for errors that result from the printing or use of these rulers.

When measurements are taken directly using tools, instruments, or other calibrated measuring devices, they are called direct measurements. For more help using the printable ruler, call us at 02 Measurements taken with this tool should be treated as estimates only.