Inspection bench for shaft concentricity checks. Made entirely from cast iron and face-hardened steel. Comprises a base on which two sliding supports stand. One support has a fixed point and the other a sliding point. The sliding supports are easily locked into position with a grip eccentric. The support with sliding point can be moved quickly using the lever or slowly using the adjustment knob (suitable for items weighing over 25 Kg.) . The two dial indicator holders are used to check the rectilinearity of items by sliding them along the base. High precision and easy of use make this instrument particularly useful for testing operations. Special applications and designs can be produced upon requirement.