• Aperture: 38 mm (1.5 in) 90° angle accurate to within ±1 sec. This square comprises a mounted pentagonal prism and is used to deviate the autocollimator beam through 90°. It may be used when checking the straightness of two surfaces which are at right angles to one another or when checking parallelism.
Optical square with UKAS Calibration
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- SKU:
- 142-77UC
