The Mitutoyo 129-128 Mechanical Depth Micrometer includes interchangeable rods to provide a wide range of measurement. This model has a total Measuring Range of 0-6" with 4 Rods and a 2.5 x 63" Base. Includes 4 Interchangeable Rods Range:0-6" Type:Depth with Interchangeable Rods Site Sort175