Features: Need to turn on the spindles speed? Never, never, never. Probe is installed, even if the concentricity is adjusted to 1 wire. Look at concentricity. It’s best to place indicator at a distance of 50mm from the chucks, which is roughly the distance between our probe and the root of the tool handle. Under normal circumstances, if the spindles by 0.01, the chucks clamps the milling cutter and the table tool holders, the error may not exceed 0.02, and the error may not exceed 0.03 at most. There will be a slight angulars deviation between the center chucks and spindles, which will be magnified by the length of your tool holders. . Usually you use calibration meter to measure the root of a milling cutter, and you not see a big error, but because the probe is about 50mm away from the tool holders. Therefore, be sure to choose genuine high-precision chucks. Specifications: Componnet:Stainless Steel Color:Black/Redness Size:Approx.13x9x8.50cm/5.12x3.54x3.34inch Package Includes: 1Pc Edges Finder note: 1.Please allow 1-2cm errors due to manual measurement, making sure that you not mind before order. 2.Due to the differences between different monitors, the picture may not reflect the actual of the item.