Dial Caliper Gages Series 209- Internal TypeSeries 209FeaturesThese Dial Caliper Gages are used only as comparison gages, and should be used along with a Setting Ring or micrometer.The caliper is spring loaded and makes point contact measuring pressure. Techinical Data: Dial Diameter: 2"50mm Measuring Force: 2.0 N or less Repeatability: .001"0.025mm