General description A precision tool for accurate measurement of depth, the Laser Tools Dial Test Indicator - DTi 2584 is ideal for finding the Top Dead Centre (TDC) on diesel engines. It is also useful for checking run out on brake discs and other applications. Technical specifications Diameter: 41mm Measuring range: 0-8mm Resolution: 0.01mm Thread size: M2.5 x 0.45 Accuracy: ±0.01mm Compatibility and accessories Mounts directly onto the TDC Indicator (Part No. 4151) for accurate TDC readings.