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CMCs General Physics (3)
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Dimensional metrology (3)
Roundness standards (3)
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United Kingdom, NPL (National Physical Laboratory)
Complete CMCs in Length for United Kingdom (.PDF file)
Roundness standards. External cylinder: roundness, 0.01 µm to 50 µm
Absolute expanded uncertainty (k = 2, level of confidence 95 %) in nm: 30
Spindle based roundness instrument
Diameter: 5 mm to 300 mm
Approved on 17 July 2014
Internal NMI service identifier: 29a
 
Roundness standards. Internal cylinder: roundness, 0.01 µm to 50 µm
Absolute expanded uncertainty (k = 2, level of confidence 95 %) in nm: 30
Spindle based roundness instrument
Diameter: 5 mm to 300 mm
Approved on 17 July 2014
Internal NMI service identifier: 30a
 
Roundness standards. Spheres and hemispheres: roundness, 0 nm to 2000 nm
Absolute expanded uncertainty (k = 2, level of confidence 95 %) in nm: 5
Multi-step, stylus on spindle roundness instrument
Diameter: 5 mm to 100 mm
Internal NMI service identifier: 38