PS4R - Stage Graticule with engraved serial number for Reflected Light

Certificates of Calibration
Wherever there is a need for measurements to be traceable for quality purposes, Pyser-SGI offer UKAS and NPL certificates of calibration that are internationally traceable, so satisfy the requirements of NIST, DIN and National Metrology Institutes across the world.
Both the NPL and UKAS certificates have the same traceability but the NPL has a 0.0002mm (0.2um) uncertainty whereas the UKAS has 0.0005mm (0.5um). Both will satisfy the requirements of ISO 17025 and other quality standards.

a) Calibration by NPL
The National Physical Laboratory carries out measurements at selected points on the scales and grids and issues a certificate of calibration.

b) Calibration by UKAS accredited laboratory
A UKAS accredited laboratory carries out measurements at selected points on the scales and grids and issues a calibration certificate.

c) Measurement by Graticules
For applications that do not require the accuracy provided by calibration carried out by NPL or a UKAS accredited laboratory, Graticules can provide a Certificate of Comparison. The scale or grid is compared with NPL calibrated in-house standards and a statement is provided on the accuracy of the item with respect to these standards. This certification is not traceable.