Accuracy: ±.0001", ±0.002mm. Instant inch/millimeter conversion. ON/OFF button (auto off after 30 minutes of non-use). Ability to zero tool at any position as well as retain and return to the true zero reading of the micrometer. Large, high-contrast LCD readout. Balanced frame and smooth friction thimble with satin chrome finish. Extremely hard, stable, one-piece spindle for superb accuracy. Micro-lapped carbide measuring faces. Ring-type knurled locking mechanism. Includes fitted plastic case.