2B006

Containing a "laser";

A 'resolution' over their full scale of 0.200 nm or less (better); and

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±0.01ºC;

‘Non-contact type measuring systems’ with a ‘resolution’ equal to or less (better) than 0,2 μm within 0 to 0,2 mm of the ‘measuring range’;

Linear position feedback units specially designed for machine tools and having an overall "accuracy" less (better) than (800 + (600 × L/1 000)) nm (L equals effective length in mm);

Measuring systems having all of the following: a. Containing a "laser"; b. A ‘resolution’ over their full scale of 0,200 nm or less (better); and c. 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

"Electronic assemblies" specially designed to provide feedback capability in systems specified in 2B006.b.3.;

Equipment for measuring surface roughness (including surface defects), by measuring optical scatter with a sensitivity of 0,5 nm or less (better).