--- product_id: 15945792 title: "178?390 Standard Detector for Surftest SJ?210 & SJ?301, 6.75\" Inside Depth, Diamond Stylus, Low?Force Precision Surface Roughness Measurement" brand: "mitutoyo" price: "$616.41" currency: USD in_stock: true reviews_count: 1 category: "Mitutoyo" url: https://www.desertcart.us/products/15945792-178-390-standard-detector-for-surftest-sj-210-and-sj store_origin: US region: United States of America --- # Diamond stylus tip for ultra-precise surface detection Seamless integration with Surftest units for advanced data control Skid force ≤ 400mN for consistent, reliable measurements 178?390 Standard Detector for Surftest SJ?210 & SJ?301, 6.75" Inside Depth, Diamond Stylus, Low?Force Precision Surface Roughness Measurement **Brand:** mitutoyo **Price:** $616.41 **Availability:** ✅ In Stock ## Summary > 💎 Elevate your surface measurement game with precision that professionals trust! ## Quick Answers - **What is this?** 178?390 Standard Detector for Surftest SJ?210 & SJ?301, 6.75" Inside Depth, Diamond Stylus, Low?Force Precision Surface Roughness Measurement by mitutoyo - **How much does it cost?** $616.41 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/15945792-178-390-standard-detector-for-surftest-sj-210-and-sj) ## Best For - mitutoyo enthusiasts ## Why This Product - Trusted mitutoyo brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Shop Floor Ready:** Robust IP54 rating and compact 6.75" design built for demanding industrial environments. - • **Precision at its Core:** Diamond stylus tip ensures micrometer-level surface roughness accuracy. - • **Effortless Data Mastery:** Connects flawlessly with Surftest SJ-210 & SJ-301 for streamlined QC and statistical processing. - • **Tailored for Every Groove:** Available in standard and deep groove types with varying head sizes to fit your exact needs. - • **Consistent Force, Consistent Results:** Built-in skid force capped at 400mN guarantees repeatable, reliable measurements every time. ## Overview The Mitutoyo 178-390 is a high-precision detector designed for use with Surftest SJ-210 and SJ-301 surface roughness testers. Featuring a diamond stylus tip and skid measurement technology with forces as low as 0.75mN, it delivers reliable, repeatable surface roughness data. Its IP54 rating and versatile detector types make it ideal for rigorous shop floor, machining, and quality control applications. ## Description Mitutoyo 178?390 Standard Detector for Surftest SJ?210 & SJ?301, 6.75" Inside Depth, Diamond Stylus, Low?Force Precision Surface Roughness Measurement: Construction Rulers: desertcart.com: Industrial & Scientific Review: Works great - We need this device for surface measurement. This is exactly what I was looking for and it works great. Thanks. ## Features - COMPATIBLE WITH SURFTEST MODELS: Designed for use with Mitutoyo Surftest SJ?210 and SJ?301 surface roughness testers in machining, shop?floor inspection, histogram-based data management, statistical analysis, and QC environments. - DIAMOND STYLUS FOR HIGH ACCURACY: Equipped with a precision diamond?tipped stylus with a controlled radius to ensure reliable, repeatable surface roughness detection across a wide range of materials. - LOW, CONTROLLED MEASURING FORCE: Features a built?in skid force of 400 mN or less, with measuring forces of 4 mN (SJ?301) or 0.75 mN (SJ?210), protecting delicate surfaces while maintaining measurement integrity. - STANDARD DETECTOR DESIGN: Offered as part of a family of detector types, including standard and deep?groove versions, with varying head sizes to match diverse surface?measurement applications. - A LEGACY OF QUALITY: Our ultra-precise measurement solutions bring improved performance to countless industries, including aerospace, medical, automotive and energy. With more than 5,500 products the largest product portfolio of any commercial metrology provider we have the solutions you need to meet today's metrological challenges and customer expectations. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B001OBYZ6O | | Adjustable Length | Yes | | Are Batteries Required | No | | Batteries Required? | No | | Best Sellers Rank | #250,474 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #6 in Surface Roughness Gauges | | Brand | Mitutoyo | | Brand Name | Mitutoyo | | Color | silver | | Customer Reviews | 5.0 out of 5 stars 8 Reviews | | Display Type | digital | | Extended Length | 6.75 Inches | | Global Trade Identification Number | 04946368041087 | | Included Components | 178-390 | | International Protection Rating | IP54 | | Item Weight | 0.25 Pounds | | Manufacturer | Mitutoyo | | Material | Plastic | | Material Type | Plastic | | Model Number | 178-390 | | Power Source | Corded Electric | | UPC | 603908263234 | | Unit Count | 1.0 Count | ## Product Details - **Batteries Required?:** No - **Brand:** Mitutoyo - **Color:** silver - **Material:** Plastic - **Power Source:** Corded Electric ## Images ![178?390 Standard Detector for Surftest SJ?210 & SJ?301, 6.75" Inside Depth, Diamond Stylus, Low?Force Precision Surface Roughness Measurement - Image 1](https://m.media-amazon.com/images/I/5102qGa62AL.jpg) ## Available Options This product comes in different **Size** options. ## Questions & Answers **Q: how deep groove can be measured ?** A: Hello dear buyer: Japan Mitutoyo 178-394, the deepest groove can measure 10mm, but 9mm is safer~ Thank you **Q: does include accesories for take meassures?** A: NO, ONLY THE PROBE **Q: Can I use on the 402?** A: This probe cannot be used on the 402 and the probe for the 402 is no longer available. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Works great *by T***E on June 24, 2013* We need this device for surface measurement. This is exactly what I was looking for and it works great. Thanks. ## Frequently Bought Together - Mitutoyo 178-390, Standard Detector for Surftest SJ-201 and SJ-301, 6.75" Inside Depth - Mitutoyo 513-403-10E DIAL TI, BAS, STD 0.008", 0.00004" Accuracy, 0.0001", White - Noga DG61003 Regular Duty Dial Gage Holder Mag Base w/Metal Fine Adjust --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.us/products/15945792-178-390-standard-detector-for-surftest-sj-210-and-sj](https://www.desertcart.us/products/15945792-178-390-standard-detector-for-surftest-sj-210-and-sj) --- *Product available on Desertcart United States of America* *Store origin: US* *Last updated: 2026-05-16*