{"product_id":"mitutoyo-178-391-surface-roughness-detector-for-sj-210","title":"Mitutoyo 178-391 Surface Roughness Detector for SJ-210","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe MITUTOYO 178-391 is a replacement stylus detector designed for use with the SJ-210 Surftest portable surface roughness tester. It operates with a 4 mN measuring force and features a 90-degree diamond tip angle, making it suited for standard surface texture measurement on flat and gently contoured workpieces. With an overall length of 61.00 mm and a body diameter of 9.00 mm, the 178-391 fits directly into the SJ-210 detector mount without modification. Metrology technicians and quality control professionals install this detector when replacing a worn or damaged stylus on the SJ-210 platform.\u003c\/p\u003e\n\u003cp\u003eThe 178-391 is used in industrial metrology applications where surface roughness measurement is required per standard QC workflows. It is specifically designed for the Mitutoyo SJ-210 Surftest portable surface roughness tester, a handheld instrument commonly found in manufacturing, machine shops, and inspection labs. The 90-degree tip angle and 10.00 micrometer stylus tip radius are appropriate for general-purpose Ra and Rz measurements on machined surfaces. This detector is classified under UNSPSC code 41114500.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e4 mN contact measuring force for consistent stylus-to-surface loading\u003c\/li\u003e\n  \u003cli\u003e90-degree diamond tip angle for standard surface roughness measurement\u003c\/li\u003e\n  \u003cli\u003e10.00 micrometer stylus tip radius for general-purpose Ra and Rz profiling\u003c\/li\u003e\n  \u003cli\u003e61.00 mm overall length with 9.00 mm body diameter for direct SJ-210 fitment\u003c\/li\u003e\n  \u003cli\u003eDrop-in replacement detector — no additional adapters required for the SJ-210\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned for use with the Mitutoyo SJ-210 Surftest portable surface roughness tester.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eInstallation should be performed by a qualified metrology technician or instrument service professional. Power down the SJ-210 unit before removing or installing the detector to avoid sensor damage. Handle the stylus tip carefully during installation — contact with hard surfaces can chip or deform the diamond tip, invalidating measurement accuracy. Follow the SJ-210 operator manual for proper detector seating and securing procedures.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMeasuring Force\u003c\/strong\u003e: 4 mN\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTip Angle\u003c\/strong\u003e: 90 degrees\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eStylus Tip Radius\u003c\/strong\u003e: 10.00 micrometers\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOverall Length\u003c\/strong\u003e: 61.00 mm\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOverall Diameter\u003c\/strong\u003e: 9.00 mm\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFor Use With\u003c\/strong\u003e: SJ-210 Surftest Portable Surface Roughness Tester\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eAccessory Type\u003c\/strong\u003e: Hole Detector\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eUNSPSC Code\u003c\/strong\u003e: 41114500\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 1 pound\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: MITUTOYO\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 178-391\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"MITUTOYO","offers":[{"title":"Default Title","offer_id":51557582537010,"sku":"178-391","price":813.03,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/ab0fac9ab278eff73475f49160499716.jpg?v=1786391341","url":"https:\/\/voomisupply.com\/products\/mitutoyo-178-391-surface-roughness-detector-for-sj-210","provider":"Voomi Supply","version":"1.0","type":"link"}