PRECISION & ACCURACY - the measuring range for stainless steel caliper measuring tools is 0-150mm / 0-6 , and the accuracy is 0005 inches (0.13m), 0.01mm. The attached locking screws prevent accidental slipping, ensure the specified position and you get error-free measurement results. TWO MEASUREMENT MODES - digital calipers 6 inch (0.15 m) stainless steel with the MM / IN button convert instantly between inches / millimeters, and you don't have to waste time on calculations. Then the knurled thumb roll and locking screw ensure smooth sliding and accurate positioning, no more wasting time finding different tools to measure SAE or metric parts. MULTIPLE MEASUREMENT OPTIONS - the 150mm caliper features two outsides baking, deep dess blade and slide rule maintenance. Measuring the outside and inside diameter (holes, slot, etc.) as well as depth and step measurement. It is widely used in industrial and automotive, professional staff, household measurement and office work. High quality material & LARGE LCD DISPLAY - the stainless steel construction allows the digital micrometer smooth sliding, sturdiness and durability, long service life, easy storage and transport guaranteed. IP 54 grade fine polished stainless steel can block splashing water and dust. The large, high-resolution LCD screen helps you get precise results quickly and easily. AUTO-OFF & GUARANTEE - Automatically shuts off to save battery after 5 minutes of inactive use. The digital caliper with battery powered body comes with a pre-installed battery (1.5V button battery) and a spare button. We promise 2 years warranty and 30 days refund service for any reasons. Product Technical Specifications * Measuring range: 0 150mm / 0-6 inch (0.15m) * Resolution: 0.01mm * Accuracy: 0.02mm (100-200mm) *Repeatability: 0.01mm *Maximum Measurement Speed: 1.5m/s, 6in/s *Measuring System: Linear Capacitive Measuring System *Display: LCD Screen *Power Supply: One 1.5V Alkaline Lithium Button Cell Type LR44 Capacity 180mAh * Working Temperature: 5- 4041 to 104 Waterproof, Dustproof, Oilproof The 12mm high-contrast large LCD digital screen x 31mm (0.47x 1.22) is quite easy to read. IP54 waterproof: splashing water, oil, dust resistance and auto power on/off are convenient to use. KEY BATTERY REPLACEMENT: -Step one: Use a screwdriver -Step two: Take off the button cover in the direction indicated by the arrow and put the button cover back one (positive side out). PACKAGE INCLUDED: 1 x Electronic Digital Caliper 1 x Plastic Case 1 x Extra Button Battery (extra) 1 x Mini Screwdriver 1 x Instruction Manual