Mitutoyo 139-180 Inside Micrometer Extension Rod Set 4-52 Inch Range

The Mitutoyo 139-180 is a comprehensive mechanical extension rod set designed for precise inside diameter measurements across a wide range of applications. This professional-grade measurement system combines extension rods with micrometer heads to achieve accurate ID measurements from 4 to 52 inches with .001 inch resolution.

Key Features:

• Measurement range: 4 to 52 inches with .001 inch graduations
• Complete extension rod set includes: 1 inch, 2 inch, 4 inch, 8 inch, and two 16 inch rods
• Modular design allows combination of extension pipes and anvils with micrometer heads for versatile measuring capability
• Mechanical inside micrometer system for reliable, repeatable measurements
• Supplied in a fitted wooden storage case for organization and protection

This extension rod set is ideal for measuring large bore diameters, internal grooves, and other inside dimensions in machining, manufacturing, and quality control applications. The mechanical design provides dependable performance without batteries or electronics, while the fitted case ensures proper storage and transport of all components.