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The accuracy for the end of a retractable tape measure is dependent on the hook's sliding mechanism and thickness. The European Commission (EC) has standardised a non-compulsory classification system for certifying tape measure accuracy, with certified tapes falling into one of three classes of accuracy: Classes I, II, and III. [32]
A variety of rulers A carpenter's rule Retractable flexible rule or tape measure A closeup of a steel ruler A ruler in combination with a letter scale. A ruler, sometimes called a rule, scale or a line gauge or metre/meter stick, is an instrument used to make length measurements, whereby a length is read from a series of markings called "rules" along an edge of the device. [1]
A measuring instrument for lengths: a typical tape measure with both metric and imperial units and two US pennies for comparison A measuring instrument is a device to measure a physical quantity . In the physical sciences , quality assurance , and engineering , measurement is the activity of obtaining and comparing physical quantities of real ...
Early Lufkin logo. The company was founded by Edward Taylor Lufkin, an American Civil War veteran of the Sixtieth Regiment Ohio Volunteer Infantry [1] in Cleveland, Ohio, 1869 [2] and was originally named E.T. Lufkin Board and Log Rule Manufacturing Company.
The metre-stick is usually employed for work on a medium scale; larger than desktop work on paper, yet smaller than large-scale infrastructure work, where tape measures or longer measuring rods are used. Typical applications of metre-sticks are for building furniture, vehicles and houses. Modern carpenters' metre-sticks are usually made to be ...
Tape measure Tape measure: A tape measure is a retractable or flexible ruler that has measurement increments as small as 1/32" or 1 millimetre. Handsaw Three old handsaws: A handsaw, according to Cambridge University, "a saw that is operated by hand rather than using electricity or a motor." [21] Files & Rasps Top two are files.
For common tape measurements, the tape used is a steel tape with coefficient of thermal expansion C equal to 0.000,011,6 units per unit length per degree Celsius change. This means that the tape changes length by 1.16 mm per 10 m tape per 10 °C change from the standard temperature of the tape.
Good surveyors will keep track of any circumstance on the path that can influence the accuracy of the distance measured and either measure that portion with an alternative, such as a surveyor's tape or measuring tape, or make a reasonable estimate of the correction to apply. Surveyor's wheels are used primarily for lower accuracy surveys.
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