---
product_id: 15945792
title: "Mitutoyo 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: "$589.07"
currency: USD
in_stock: true
category: "Mitutoyo"
url: https://www.desertcart.us/products/15945792-mitutoyo-178-390-standard-detector-for-surftest-sj-210-sj
store_origin: US
region: United States of America
---

# Diamond-tipped stylus for ultra-precise detection 6.75" adjustable inside depth for versatile use Low-force measurement protects delicate surfaces Mitutoyo 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:** $589.07
**Availability:** ✅ In Stock

## Summary

> 💎 Measure with confidence, inspect with precision — don’t let surface flaws slip by!

## Quick Answers

- **What is this?** Mitutoyo 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?** $589.07 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-mitutoyo-178-390-standard-detector-for-surftest-sj-210-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

- • **Robust & Ready:** IP54-rated construction means this detector thrives in demanding shop-floor and industrial environments.
- • **Effortless Versatility:** Compatible with Mitutoyo Surftest SJ-210 & SJ-301 models, seamlessly integrating into your existing quality control workflow.
- • **Industry-Leading Legacy:** Backed by Mitutoyo’s extensive portfolio and trusted by aerospace, automotive, and medical pros worldwide.
- • **Optimized Force Control:** Low measuring force (as low as 0.75 mN) safeguards delicate surfaces while delivering reliable data every time.
- • **Precision Meets Protection:** Diamond stylus with controlled radius ensures repeatable, high-accuracy surface roughness readings without damaging sensitive materials.

## Overview

The Mitutoyo 178-390 Standard Detector is a precision surface roughness measurement tool designed for Surftest SJ-210 and SJ-301 testers. Featuring a diamond-tipped stylus and ultra-low measuring force, it delivers accurate, repeatable readings while protecting delicate surfaces. With a 6.75-inch adjustable inside depth and IP54 rating, it’s built for rigorous industrial and quality control environments, trusted across aerospace, automotive, and medical industries.

## Description

Mitutoyo 178-390 Standard Detector for Surftest SJ-210 & SJ-301, 6.75" Inside Depth, Diamond Stylus, Low-Force Precision Surface Roughness Measurement | For Surftest SJ-210, For Surftest SJ-301: Construction Rulers: desertcart.com: Industrial & Scientific

## 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 | #106,603 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #2 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 | 4 ounces |
| Manufacturer | Mitutoyo |
| Manufacturer Part Number | 178-390 |
| Material | Plastic |
| Material Type | Plastic |
| Model Number | 178-390 |
| Power Source | Corded Electric |
| Recommended Uses For Product | machining, shop floor inspection, histogram-based data management, statistical analysis, quality control, surface roughness measurement |
| UPC | 603908263234 |
| Unit Count | 1.0 Count |

## Product Details

- **Batteries Required?:** No
- **Brand:** Mitutoyo
- **Color:** silver
- **Material:** Plastic
- **Power Source:** Corded Electric

## Images

![Mitutoyo 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.

## 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-mitutoyo-178-390-standard-detector-for-surftest-sj-210-sj](https://www.desertcart.us/products/15945792-mitutoyo-178-390-standard-detector-for-surftest-sj-210-sj)

---

*Product available on Desertcart United States of America*
*Store origin: US*
*Last updated: 2026-07-04*