Product Description Tubular Inside Micrometers are precision measuring instruments used to measure the inside diameter of cylindrical objects. These micrometers consist of a measuring head and a tubular extension rod that can be adjusted to reach the desired depth of the object being measured. Key Features - Contain a set of interchangeable extension tubes that can be used singly or in combination - Covering a wide range of measurement - Includes a setting piece for initial calibration of gauge - Accuracy conforms to DIN 863/BS 870 - Corrosion-resistant Tungsten Carbide measuring face/anvils for exceptional durability - Satin-chromed body - House in a fitted case with adjustment spanner - No batteries required Specification -Mechanical Tubular Rod Inside Micrometer -Range: 2-24"; Graduation: 0.001"; Comply with Standard: BS 870