Dimensional inspection or measuring systems, equipment and ‘electronic assemblies’, as follows: (a) Computer-controlled or ‘numerically controlled’ Coordinate Measuring Machines (CMM), having a three-dimensional (volumetric) maximum permissible error of length measurement (E0,MPE) at any point within the operating range of the machine (i.e., within the length of axes) equal to or less (better) than 1,7 + L/1 000 μm (L is the measured length in mm), according to ISO 10360-2 (2009); (b) Linear and angular displacement measuring instruments, as follows: 1. ‘Linear displacement’ measuring instruments having any of the following: a. Non-contact-type measuring systems with a ‘resolution’ equal to or less (better) than 0,2 μm within a measuring range up to 0,2 mm; b. Linear Variable Differential Transformer (LVDT) systems: 1. Having any of the following: a. ‘Linearity’ equal to or less (better) than 0,1 % measured from 0 to the ‘full operating range’, for LVDTs with a ‘full operating range’ up to and including ± 5 mm; or b. ‘Linearity’ equal to or less (better) than 0,1 % measured from 0 to 5 mm for LVDTs with a ‘full operating range’ greater than ± 5 mm; and 2. Drift equal to or less (better) than 0,1 % per day at a standard ambient test room temperature ± 1 K; Technical note: For the purposes of item b. above, ‘full operating range’ is half of the total possible linear displacement of the LVDT. For example, LVDTs with a ‘full operating range’ up to and including ± 5 mm can measure a total possible linear displacement of 10 mm. c. Measuring systems having all of the following: 1. Containing a ‘laser’; 2. A ‘resolution’ over their full scale of 0,200 nm or less (better); and 3. Capable of achieving a ‘measurement uncertainty’ equal to or less (better) than (1,6 + L/2 000 ) nm (L is the measured length in mm) at any point within a measuring range, when compensated for the refractive index of air and measured over a period of 30 seconds at a temperature of 20 ± 0,01 °C; or d. ‘Electronic assemblies’ specially designed to provide feedback capability in systems specified above; 2. Angular displacement measuring instruments; Note : The category above does not apply to optical instruments, such as autocollimators, using collimated light (e.g., ‘laser’ light) to detect angular displacement of a mirror. (c) Equipment for measuring surface roughness (including surface defects), by measuring optical scatter with a sensitivity of 0,5 nm or less (better).