The scale is chrome deposited centrally on a glass disc mounted in a stainless steel slide mount, 76mmx 25mm x 1.5mm thick, with unique serial number engraved in the top surface. These are the products of choice where you need certified scales to have unequivocal traceability for ISO, NIST, DIN, DKD, Cofrac or other standards. These products are supplied in a polished wooden case to indicate that they are superior calibration tools.
Available in transmitted and reflected (incident) light versions. All transmitted light micrometer scales have a cover glass optically cemented over the image.