Designed to measure the diameter of workpiece with odd  flutes, such as end mills, taps, reamers and the like. 
                                                          Used to measure shafts for lobe-error (out of roundness) . 
                                                          Used to measure the diameter of workpiece formed with circular arrays, such as fan blades. 
                                                          Used to measure the diameter of Roots Blower with 3 blades.  
                                                          Easy to operate with high efficiency. 
                                                          mm/inch conversion. 
                                                          Zero-setting at any position. 
                                                          With data output.
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