Mitutoyo 178-390 Surface Roughness Detector for SJ-210

Product Description

The MITUTOYO 178-390 is a replacement stylus detector designed for surface roughness measurement on Mitutoyo Surftest portable surface roughness testers. It operates with a 4 mN measuring force and a 90-degree tip angle, suited for standard surface texture evaluation. The detector measures 9.00 mm in overall diameter and 61.00 mm in overall length, with a stylus radius of 5.00 micrometers. Licensed metrology technicians, quality control inspectors, and precision machining professionals install and use this detector as part of routine surface finish verification workflows.

This detector is intended for use with the Mitutoyo SJ-210 Surftest portable surface roughness tester. It is classified as a hole detector accessory type under UNSPSC code 41114500, making it appropriate for applications requiring measurement inside bores or restricted surface geometries. Typical use cases include incoming inspection, in-process quality checks, and final surface finish verification on machined, ground, or honed components in manufacturing and metrology environments.

Key Features

• 90-degree tip angle for standard and hole surface roughness measurement applications
• 4 mN measuring force minimizes stylus pressure on sensitive or finished surfaces
• 5.00 micrometer stylus tip radius for fine surface texture resolution
• 9.00 mm overall diameter and 61.00 mm overall length for compact fitment
• OEM-style accessory designed specifically for Mitutoyo Surftest portable testers

Compatibility

Designed for use with the Mitutoyo SJ-210 Surftest portable surface roughness tester. Classified as a hole detector accessory type.

Installation Notes

Installation of this detector should be performed by a qualified metrology technician or instrumentation specialist. Power down and zero the surface roughness tester before swapping detectors to protect the stylus and measurement electronics. Handle the stylus tip with care to avoid contact damage, as tip radius integrity directly affects measurement accuracy. Follow the instrument manufacturer documentation for proper detector seating and force calibration verification after replacement.