[Features] Achieves world-class high performance. The battery life is about 2.4 years and reduces annoying battery replacement. ·The frame cover and surface panel have been adopted for hand-held measurement in mind. All plastic parts are made of oil-resistant material. Models (MDC-MX/MXT) with measurement data output function can be configured with a statistical process management system and measuring system. There are many convenient interface input tools that convert measurement data to a keyboard signal and input directly into the cells of the commercially available table calculators. There are 2 types of fixed pressure devices including ratchet stop and ratchet thimble. Specifications: Measurement range: 3.0 - 3.9 inches (75 - 100 mm); Deviation difference (μm): ±2; Parallel degree (μm): 2; Constant pressure device: ratchet stop; Minimum display amount: 0.01; Quantum error is not included ±1 count; Flatness (μm): 0.3; Protection Rating: IP65 (IEC605 (IEC - 105 - 105 - 105 - 10 - 10 - 10 - 10 - 10 - Power Supply : Button Shape: Silver Oxide Battery SR44 (No. 938882) x 1; Battery Life: Approx. 2.4 years (normal use) Position Detection Method: Electromagnetic induction rotary encoder [Caution] ·Standard silver oxide battery included is for monitoring. It has an IP65 protection grade, but it is necessary to prevent rust after use.