Mitutoyo 178-394 Deep Groove Detector 90 Degree Tip SJ-210

Product Description

The MITUTOYO 178-394 is a deep groove detector accessory designed for use with the SJ-210 Surftest portable surface roughness tester. It measures surface roughness inside narrow grooves and recessed features where standard styli cannot reach. The detector applies a 4mN measuring force and features a 90-degree tip angle, making it suited for profiling deep channels, slots, and undercuts. With an overall length of 61.00 mm and a diameter of 9.00 mm, it integrates directly with the SJ-210 probe arm. Licensed metrology technicians and quality control professionals are the primary installers and operators of this accessory.

This detector is intended for precision surface finish measurement applications in manufacturing, machining, and quality inspection environments. It is commonly used when the workpiece geometry requires a steep-angle stylus to access deep or narrow surface features that a standard detector cannot reach. The 5-micrometer tip radius provides fine-detail surface profile acquisition in grooves and recessed areas. It is appropriate for both production floor and laboratory metrology setups running the Mitutoyo SJ-210 Surftest system.

Key Features

• 90-degree tip angle for access to deep grooves and recessed surface features
• 4mN measuring force minimizes surface contact pressure during profiling
• 5-micrometer tip radius for fine surface detail acquisition
• Overall length of 61.00 mm and diameter of 9.00 mm for compact integration
• Designed as a direct accessory for the Mitutoyo SJ-210 Surftest portable surface roughness tester

Compatibility

Designed for use with the Mitutoyo SJ-210 Surftest Portable Surface Roughness Tester, as specified by the manufacturer.

Installation Notes

Installation and replacement of this detector should be performed by a qualified metrology technician familiar with the SJ-210 system. Power down or disconnect the tester before swapping detector accessories to avoid damage to the probe arm or measurement circuitry. Handle the stylus tip with care, as contact with hard surfaces can damage the tip geometry and affect measurement accuracy. Follow all manufacturer setup and calibration procedures after attaching a new detector before taking measurements.