Features:1. This is a measuring tool that can quickly set mechanical spindle and workpiece datum to the exact center position.2. The probe uses full ceramic material, non-magnetic.3. Measure at the rotary speed of 600-950rpm.4. With wear resistant, anti-static properties.5. High precision, long service life.Specification:Material: Ceramic (probe), tool steel (body)Hardness: body >HRC62°, probe >HV1350Accuracy: ±0.002mmBody diameter: 10 mm/0.4inProbe diameter: 10 mm/0.4inTotal length: 86mm/3.4inPackage weight: Approx. 114g/4.0ozPackage list:1 x Edge FinderNote: 1. Due to the difference between monitors and light effects, the pictures may not reflect the actual color of the item. 2. Please allow slight error due to manual measurement. Thanks for your understanding.3. Please notethat the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering..