Mitutoyo 178-385 Deep Groove Detector Stylus Accessory 0.75mN 2µmR/60° for Surftest SJ-210 / SJ-310

The Mitutoyo 178-385 is an optional accessory deep groove detector designed for use with the Mitutoyo Surftest SJ-210 and SJ-310 surface roughness testers. This specialized stylus enables precise surface texture measurements in deep, narrow grooves and recessed features that standard detectors cannot access.

Key Specifications:

• Measuring Force: 0.75 mN — ultra-low contact force to protect delicate workpiece surfaces
• Stylus Tip Radius: 2 µm (micrometer)
• Stylus Tip Angle: 60° included angle for deep groove access
• Compatible Instruments: Mitutoyo Surftest SJ-210, Surftest SJ-310
• Accessory Type: Optional replacement/additional detector stylus

Important Note: This detector is not compatible with the transverse tracing drive unit attachment.

The 178-385 deep groove detector is ideal for quality control and metrology applications requiring accurate surface finish measurement in confined or hard-to-reach areas. The 2 µm tip radius conforms to ISO and JIS stylus standards, ensuring consistent, reliable Ra, Rz, and other surface roughness parameter readings in production and laboratory environments.