Mitutoyo 129-127 Depth Micrometer, 0 to 4" Measuring Range, 0.001" Resolution, 2.5" Base, 4 Interchangeable Rods Measurement range of 0 to 4", and resolution of 0.001" Vernier scale for precise measurements in fine units Includes interchangeable 0.157" diameter measuring rods that can be adjusted in 1" increments for flexibility Ratchet stop and measuring rod clamp for precise measurements Satin chrome finish on the body for readability and hardened steel base for durability and accuracy