Mitutoyo Tubular Inside Micrometer Set This set allows you to measure a wide range of ID measurements by combining extension rods (pipes) and anvils with the micrometer head. Carbide-tipped measuring faces are available. Specifications include... 50-1000mm Measuring Range 0.01mm Grads Accuracy: +(3+n+L/50)um L=Maximum Measuring length (mm) n=Number of Rods Fraction rounded up Set includes... Micrometer Head Extension Rods 13mm, 25mm, 50mm (2 pcs), 100mm, 200mm (2 pcs), 300mm