3.3gaugelengthdistance between the two effective clamping points of a testing deviceNote 1 to entry: The effective clamping points (or lines) of jaws can be checked by clamping a test specimen under defined pretension with carbon copy paper to produce a gripping pattern on the test specimen and/or the jaw faces.3.4initial lengthlength of a test specimen under specified pretension between the two effective clamping points at the beginning of certain testsNote 1 to entry: See also 3.3.3.5pretensionforce applied to a test specimen at the beginning of certain testsNote 1 to entry: Pretension is used to determine the initial length of the test specimen (see also 3.4 and 3.7).3.6extensionincrease in length of a test specimen produced by a forceNote 1 to entry: Extension is expressed in units of length.3.7elongationratio of the extension of a test specimen to its initial lengthNote 1 to entry: Elongation is expressed as a percentage.3.8elongation at maximum forceelongation of a test specimen produced by the maximum forceNote 1 to entry: See