The Mitutoyo 137-204 Extension Rod Tubular Inside Micrometer - Metric has the following specifications:
● Range: 50 - 1000mm
● Travel of micrometer head: 13mm
● Accuracy: +/-(3+n+L/50)μm L=Maximum measuring length (mm) n=Number of rods Fraction rounded up
● Graduation: 0.01mm or .001"
● Extension rods: 13mm, 25mm, 50mm (2 pcs.), 100mm, 200mm (2pcs.), and 300mm
● Wide range of ID measurements by combining extension rods (pipes) and anvils with the micrometer head.
● Carbide-tipped measuring faces are available.
● Supplied in fitted plastic case except 1500mm / 60" come in wooden case.