Mitutoyo 139-178 Inside Micrometer Extension Pipe Set 4-20 Inch Range

The Mitutoyo 139-178 is a precision extension pipe set designed for use with tubular inside micrometers, enabling accurate internal diameter measurements from 4 to 20 inches. This professional-grade measurement system combines extension pipes with micrometer heads to provide versatile ID measurement capabilities across a wide range of applications.

Key Features:

• Measurement range: 4 to 20 inches
• Includes extension pipes in 1-inch, 2-inch, 4-inch, and 8-inch lengths
• 1-inch travel micrometer head for precise adjustments
• Compatible with tubular inside micrometer systems
• Modular design allows combination of extension pipes and anvils for custom measurement ranges
• Supplied in a fitted wooden storage case for protection and organization

This extension pipe set is ideal for precision measurement applications in manufacturing, quality control, and machine shop environments where accurate internal diameter measurements are critical. The modular system design provides flexibility to configure the tool for specific measurement requirements.