MST Test Bar Check Mate

A high-precision standard tool designed for inspecting and maintaining machine spindle accuracy. It features a unique hollow-body design, making it 20% lighter than conventional models for easier handling and reduced spindle strain. The drive-key-less design allows for seamless 360-degree run-out inspections, while actual measurement values are marked directly on the body for instant verification. Equipped with protective rings to prevent damage, it is an essential tool for preventive maintenance and Z-axis datum setting.