{"product_id":"insize-digital-wide-range-three-points-internal-micrometer","title":"INSIZE Digital Wide Range Three Points Internal Micrometer","description":"\u003ch1\u003eINSIZE Digital Wide Range Three Points Internal Micrometer\u003c\/h1\u003e\n\u003cp\u003eThe \u003cstrong\u003eINSIZE Digital Wide Range Three Points Internal Micrometer\u003c\/strong\u003e are precision bore-measuring instruments designed for accurate measurement of internal diameters in machining, manufacturing, inspection, and quality-control applications. Using a three-point measuring system with carbide measuring faces, these digital internal micrometers provide stable, repeatable measurements across a wide range of bore sizes.\u003c\/p\u003e\n\u003cp\u003eDesigned to meet \u003cstrong\u003eDIN 863-4\u003c\/strong\u003e, the 3128 series combines a digital display, 0.001 mm resolution, IP54 dust and water resistance, data output, and included extension rods for applications requiring precise internal dimensional measurement.\u003c\/p\u003e\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eThree-Point Internal Measurement\u003c\/strong\u003e — Three measuring contacts provide stable positioning inside a bore for accurate internal diameter measurement.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eWide Measuring Ranges\u003c\/strong\u003e — Five configurations cover internal diameters from \u003cstrong\u003e50 mm through 300 mm\u003c\/strong\u003e.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eHigh Resolution\u003c\/strong\u003e — Provides \u003cstrong\u003e0.001 mm \/ 0.00005\" resolution\u003c\/strong\u003e on most models.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eCarbide Measuring Faces\u003c\/strong\u003e — Durable carbide contact surfaces are designed for repeated precision measurement.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eIP54 Protection\u003c\/strong\u003e — Dust and water resistance helps protect the instrument in demanding shop-floor environments.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eDigital Display\u003c\/strong\u003e — Provides a clear electronic measurement readout in metric or inch format.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eData Output\u003c\/strong\u003e — Supports electronic transfer of measurement data for inspection and quality-control workflows.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eSetting Rings\u003c\/strong\u003e — Setting rings are included with the 50–70, 70–100, 100–150, and 150–250 mm models for calibration and setup.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eExtension Rods Included\u003c\/strong\u003e — Supplied with 150 mm extension rods to expand measurement capability.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eRatchet Stop\u003c\/strong\u003e — Helps provide consistent measuring force during operation.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003e\u003cstrong\u003eAutomatic Power-Off\u003c\/strong\u003e — Conserves battery power when the instrument is not in use.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003ePrecision Three-Point Bore Measurement\u003c\/h3\u003e\n\u003cp\u003eUnlike general-purpose calipers, an internal micrometer is designed specifically for measuring the inside diameter of a bore. The three-point configuration contacts the internal surface at multiple points, helping establish a stable measurement position within cylindrical features.\u003c\/p\u003e\n\u003cp\u003eThis makes the INSIZE 3128 series particularly useful when accurate bore dimensions are important for \u003cstrong\u003emachining, component inspection, and quality control\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003eThe carbide measuring faces provide durable contact surfaces for repeated measurements, while the ratchet stop helps the operator apply consistent measuring force.\u003c\/p\u003e\n\u003ch3\u003eWide Measurement Capability\u003c\/h3\u003e\n\u003cp\u003eThe 3128 series provides five overlapping measurement ranges:\u003c\/p\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eModel\u003c\/th\u003e\n\u003cth align=\"right\"\u003eMeasuring Range\u003c\/th\u003e\n\u003cth align=\"right\"\u003eAccuracy\u003c\/th\u003e\n\u003cth align=\"right\"\u003eResolution\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e3128-70\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd align=\"right\"\u003e50–70 mm \/ 1.97–2.76\"\u003c\/td\u003e\n\u003ctd align=\"right\"\u003e5 μm\u003c\/td\u003e\n\u003ctd align=\"right\"\u003e0.001 mm \/ 0.00005\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e3128-100\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd align=\"right\"\u003e70–100 mm \/ 2.76–3.94\"\u003c\/td\u003e\n\u003ctd align=\"right\"\u003e5 μm\u003c\/td\u003e\n\u003ctd align=\"right\"\u003e0.001 mm \/ 0.00005\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e3128-150\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd align=\"right\"\u003e100–150 mm \/ 3.94–5.91\"\u003c\/td\u003e\n\u003ctd align=\"right\"\u003e6 μm\u003c\/td\u003e\n\u003ctd align=\"right\"\u003e0.001 mm \/ 0.00005\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e3128-250\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd align=\"right\"\u003e150–250 mm \/ 5.91–9.84\"\u003c\/td\u003e\n\u003ctd align=\"right\"\u003e8 μm\u003c\/td\u003e\n\u003ctd align=\"right\"\u003e0.001 mm \/ 0.00005\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003e3128-300\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd align=\"right\"\u003e200–300 mm \/ 7.87–11.81\"\u003c\/td\u003e\n\u003ctd align=\"right\"\u003e9 μm\u003c\/td\u003e\n\u003ctd align=\"right\"\u003e0.001 mm \/ 0.0001\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003eSpecifications are based on the current INSIZE 3128 product documentation.\u003c\/p\u003e\n\u003ch3\u003eDigital Measurement \u0026amp; Data Output\u003c\/h3\u003e\n\u003cp\u003eThe INSIZE 3128 series provides digital measurement in both \u003cstrong\u003emillimeters and inches\u003c\/strong\u003e, with dedicated buttons for on\/off, setting, and unit selection.\u003c\/p\u003e\n\u003cp\u003eThe instrument also provides \u003cstrong\u003edata output\u003c\/strong\u003e, making it suitable for inspection environments where measurement results need to be transferred into a digital quality-control or measurement-recording system. An optional data output cable is available for compatible configurations.\u003c\/p\u003e\n\u003ch3\u003eCalibration \u0026amp; Setting Rings\u003c\/h3\u003e\n\u003cp\u003eProper calibration is essential when performing precision bore measurements.\u003c\/p\u003e\n\u003cp\u003eSetting rings are included with the \u003cstrong\u003e3128-70, 3128-100, 3128-150, and 3128-250\u003c\/strong\u003e models. The 3128-300 uses a \u003cstrong\u003eØ200 mm setting ring, available separately\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003eThe supplied setting rings allow the micrometer to be checked and adjusted against a known reference before measurement.\u003c\/p\u003e\n\u003ch3\u003eExtension Rods\u003c\/h3\u003e\n\u003cp\u003eEach 3128 configuration is supplied with a \u003cstrong\u003e150 mm extension rod\u003c\/strong\u003e, providing additional flexibility when measuring deeper internal features.\u003c\/p\u003e\n\u003cp\u003eBecause the extension rod changes the measuring configuration, proper calibration should be performed after installing an extension rod to maintain measurement accuracy.\u003c\/p\u003e\n\u003ch3\u003eIP54 Protection\u003c\/h3\u003e\n\u003cp\u003eThe 3128 series features an \u003cstrong\u003eIP54 dust and water-resistant design\u003c\/strong\u003e, making it suitable for use in manufacturing and inspection environments where the measuring instrument may be exposed to shop-floor dust or incidental moisture.\u003c\/p\u003e\n\u003ch3\u003eApplications\u003c\/h3\u003e\n\u003cp\u003eThe INSIZE Digital Wide Range Three Points Internal Micrometers are well suited for:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003eBore diameter measurement\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eInternal diameter inspection\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eMachined component inspection\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003ePrecision machining\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eManufacturing quality control\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eDimensional inspection\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eProduction inspection\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eTool and die work\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eEngineering applications\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eComponent verification\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eLarge-part inspection\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eIndustries\u003c\/h3\u003e\n\u003cp\u003eTypical applications include:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003ePrecision machining\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eManufacturing\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eAutomotive\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eAerospace\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eMetalworking\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eTool and die\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eIndustrial equipment\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eEngineering\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eQuality assurance\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eProduction inspection\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eDetails\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eINSIZE\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSeries\u003c\/td\u003e\n\u003ctd\u003e3128\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProduct Type\u003c\/td\u003e\n\u003ctd\u003eDigital Three-Point Internal Micrometer\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMeasurement Type\u003c\/td\u003e\n\u003ctd\u003eInternal Diameter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStandard\u003c\/td\u003e\n\u003ctd\u003eDIN 863-4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMeasuring System\u003c\/td\u003e\n\u003ctd\u003eThree-Point\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eResolution\u003c\/td\u003e\n\u003ctd\u003e0.001 mm \/ 0.00005\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003e3128-300 Resolution\u003c\/td\u003e\n\u003ctd\u003e0.001 mm \/ 0.0001\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eProtection\u003c\/td\u003e\n\u003ctd\u003eIP54\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMeasuring Faces\u003c\/td\u003e\n\u003ctd\u003eCarbide\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMeasurement Units\u003c\/td\u003e\n\u003ctd\u003emm \/ inch\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eData Output\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAutomatic Power-Off\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eRatchet Stop\u003c\/td\u003e\n\u003ctd\u003eYes\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eExtension Rod\u003c\/td\u003e\n\u003ctd\u003e150 mm included\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSetting Ring\u003c\/td\u003e\n\u003ctd\u003eIncluded on most models\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eData Cable\u003c\/td\u003e\n\u003ctd\u003eOptional\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch3\u003eChoosing the Right Model\u003c\/h3\u003e\n\u003cp\u003eSelecting the correct 3128 model depends primarily on the \u003cstrong\u003einternal diameter you need to measure\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003eFor example:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cp\u003eChoose \u003cstrong\u003e3128-70\u003c\/strong\u003e for 50–70 mm bores.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eChoose \u003cstrong\u003e3128-100\u003c\/strong\u003e for 70–100 mm bores.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eChoose \u003cstrong\u003e3128-150\u003c\/strong\u003e for 100–150 mm bores.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eChoose \u003cstrong\u003e3128-250\u003c\/strong\u003e for 150–250 mm bores.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cp\u003eChoose \u003cstrong\u003e3128-300\u003c\/strong\u003e for 200–300 mm bores.\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eWhen selecting an internal micrometer, choose a range that accommodates the bore diameter you need to inspect while providing an appropriate measurement range for your application.\u003c\/p\u003e\n\u003cp\u003eIf you're unsure which model is right for your application, \u003cstrong\u003econtact CRB Supply before ordering\u003c\/strong\u003e. We can help you select the appropriate INSIZE configuration.\u003c\/p\u003e\n\u003ch3\u003eTechnical Documentation\u003c\/h3\u003e\n\u003cp\u003eFor complete specifications, dimensions, accuracy information, and additional technical details, refer to the official INSIZE documentation:\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e\u003ca href=\"https:\/\/www.insize.com\/pdf-viewer?=\/PDF\/3128.pdf\"\u003eView INSIZE 3128 Series Technical Documentation\u003c\/a\u003e\u003c\/strong\u003e\u003c\/p\u003e\n\u003ch3\u003eNeed Help Selecting the Right Internal Micrometer?\u003c\/h3\u003e\n\u003cp\u003eChoosing the correct bore-measuring instrument can depend on the diameter, depth, required accuracy, and inspection process.\u003c\/p\u003e\n\u003cp\u003eIf you know the \u003cstrong\u003ebore diameter, required tolerance, and measurement depth\u003c\/strong\u003e, contact \u003cstrong\u003eCRB Supply\u003c\/strong\u003e before ordering and we'll help you identify the appropriate INSIZE model.\u003c\/p\u003e","brand":"Insize","offers":[{"title":"50-70mm\/1.97-2.76\"","offer_id":48440930369794,"sku":"3128-70","price":1152.9,"currency_code":"USD","in_stock":true},{"title":"70-100mm\/2.76-3.94\"","offer_id":48440930402562,"sku":"3128-100","price":1535.07,"currency_code":"USD","in_stock":true},{"title":"100-150mm\/3.94-5.91\"","offer_id":48440930435330,"sku":"3128-150","price":2563.07,"currency_code":"USD","in_stock":true},{"title":"150-250mm\/5.91-9.84\"","offer_id":48440930468098,"sku":"3128-250","price":5164.57,"currency_code":"USD","in_stock":true},{"title":"200-300mm\/7.87-11.81\"","offer_id":48440930500866,"sku":"3128-300","price":7206.69,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0753\/9074\/6882\/files\/Digital_Wide_Range_Three_Points_Internal_Micrometer.jpg?v=1788673569","url":"https:\/\/www.crbsupply.com\/products\/insize-digital-wide-range-three-points-internal-micrometer","provider":"CRB Supply","version":"1.0","type":"link"}