{"product_id":"starrett-50988-micrometer-calibration-standard-250mm","title":"Starrett 50988 Micrometer Calibration Standard 250mm","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe STARRETT 50988 is a spherical end micrometer calibration standard designed to verify and maintain the accuracy of outside micrometers. At 250mm in length, this reference bar provides a stable, precise setting reference for technicians performing routine calibration checks or zero-setting adjustments on outside micrometers. The included heat insulating handle minimizes dimensional error caused by thermal expansion from hand contact, which is critical when working to tight tolerances. This tool is used by quality control technicians, machinists, and metrology professionals who require traceable, repeatable calibration references in production and inspection environments.\u003c\/p\u003e\n\u003cp\u003eThis calibration standard is suited for use in machine shops, tool rooms, and inspection labs where outside micrometers require periodic verification. The 250mm length makes it appropriate for setting and checking large-range micrometers. It is a hands-on reference standard intended for bench use during tool calibration routines and is not a measuring instrument itself. Trade professionals in precision machining, aerospace, and general manufacturing will find this standard fits standard metrology workflows.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e250mm reference length for calibrating large-range outside micrometers\u003c\/li\u003e\n  \u003cli\u003eSpherical ends provide consistent, repeatable contact points for accurate setting\u003c\/li\u003e\n  \u003cli\u003eIncludes heat insulating handle to prevent thermal expansion errors during handling\u003c\/li\u003e\n  \u003cli\u003eCompact package weight of 0.5 pounds for easy bench handling and storage\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned for use with outside micrometers requiring a 250mm calibration reference standard. No specific compatible model numbers were provided in the product data.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eThis calibration standard requires no installation. Always use the included heat insulating handle when holding the standard to prevent body heat from affecting the reference dimension. Store the standard in its protective case when not in use to prevent surface damage to the contact ends. Calibration procedures should follow applicable metrology standards and shop quality control protocols.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eReference Length\u003c\/strong\u003e: 250mm\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eEnd Type\u003c\/strong\u003e: Spherical\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\n\u003ch4\u003eStandard Information\u003c\/h4\u003e\n\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: 50988\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"STARRETT","offers":[{"title":"Default Title","offer_id":51544175444274,"sku":"50988","price":119.58,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/3b43e8acd954c3b917a937434f3b71ae_ed464e21-e565-42e8-a8fd-9cb646f9a1a8.jpg?v=1785925229","url":"https:\/\/voomisupply.com\/products\/starrett-50988-micrometer-calibration-standard-250mm","provider":"Voomi Supply","version":"1.0","type":"link"}