Type:Magnetic Base Material: Metal Read the scale line(i.e.the whole number of mm)that the small pointer turns, then read the scale line(i.e the decimal part) that the large pointer turns,multiply by 0.01,and add the two to get the measured value The accuracy of the dial indicator is 0.01mm, which can more accurately measure the concentricity of the main body. The scale is clear, and the reading is intuitive and convenient., Manufacturer: EDEDE