{"product_id":"starrett-50992-micrometer-calibration-standard-300mm","title":"Starrett 50992 Micrometer Calibration Standard 300mm","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe STARRETT 50992 is a spherical end micrometer calibration standard designed to verify and maintain the accuracy of outside micrometers used in precision measurement applications. Measuring 300mm in length, this calibration standard delivers an accuracy of 0.0043 mm, making it suitable for demanding metrology and quality-control environments. The unit ships with a heat insulating handle, which allows technicians to hold the standard without transferring body heat to the gauge body and introducing thermal error into calibration readings. Weighing 0.5 pounds, the standard is compact enough for bench use or tool-crib storage.\u003c\/p\u003e\u003cp\u003eThis calibration standard is used in machine shops, manufacturing facilities, and metrology labs where outside micrometers must be periodically checked against a traceable reference. The spherical contact ends accommodate standard micrometer anvil geometry and make it straightforward to seat the standard consistently across repeated measurements. The included heat insulating handle is an important detail in any environment where precision is measured in microns, as it limits thermal expansion effects during the calibration procedure.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e300mm reference length for calibrating outside micrometers\u003c\/li\u003e\n\u003cli\u003eAccuracy of 0.0043 mm for high-precision verification\u003c\/li\u003e\n\u003cli\u003eSpherical ends for consistent, repeatable seating against micrometer anvils\u003c\/li\u003e\n\u003cli\u003eIncludes heat insulating handle to minimize thermal measurement error\u003c\/li\u003e\n\u003cli\u003eLightweight at 0.5 pounds for easy bench handling\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned for use with outside micrometers requiring a 300mm calibration reference standard; consult your micrometer manufacturer specifications to confirm range compatibility before use.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eCalibration standards should be handled by a qualified metrologist or tool-room technician following the shop calibration procedure. Always hold the standard by the heat insulating handle to prevent body-heat transfer from affecting the reference length. Store the standard in its protective case when not in use and allow it to thermally stabilize to the ambient environment before taking calibration readings. Periodic recertification of the standard itself against a traceable reference is recommended to maintain measurement integrity.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eLength\u003c\/strong\u003e: 300mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAccuracy\u003c\/strong\u003e: 0.0043 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncludes Heat Insulating Handle\u003c\/strong\u003e: Yes\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 0.5 pounds\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eStandard Information\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand\u003c\/strong\u003e: STARRETT\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 50992\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"STARRETT","offers":[{"title":"Default Title","offer_id":51539247169842,"sku":"50992","price":127.83,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/3b43e8acd954c3b917a937434f3b71ae.jpg?v=1785837070","url":"https:\/\/voomisupply.com\/products\/starrett-50992-micrometer-calibration-standard-300mm","provider":"Voomi Supply","version":"1.0","type":"link"}