ACCURACY AND PRECISION - The measuring range of stainless steel caliper gauges is 0-150mm/0-6, and the accuracy is 0005 (0.13m), 0.01mm. The attached locking screws prevent any accidents While sliding, ensure the specified position and you get error-free measurement results. TWO MEASUREMENT MODES - The 6 stainless steel digital calipers inches (0.15m) with MM/IN button instantly convert between inches/millimeters, no need to waste time on calculations. Then the knurled roller and locking screw ensure smooth sliding and precise positioning, no more time wasted finding different tools to measure SAE or metric parts. MORE MEASURING POSSIBILITIES - the 150mm caliper has two outer jaws, depth measuring blades and slide rule maintenance. Measurement of outer and inner diameter (holes, slot, etc.) as well as depth and pitch measurement. It is widely used in industrial and automotive, professional, home and office measuring fields. High quality material and LARGE LCD SCREEN - stainless steel construction allows the digital micrometer to slide smoothly , ensures robustness and durability, long service life, easy storage and transportation. Finely polished IP 54 class stainless steel can block splashes of water and dust. The large, high-resolution LCD screen helps you get accurate results quickly and easily. AUTO-OFF &amp; GUARANTEE - automatic shutdown to save battery after 5 minutes of idle operation. The digital brake caliper with battery box comes with a pre-installed battery (1.5V button cell) and a replacement button. We promise 2 years warranty and 30 days money back service for any reasons. Product Description Technical specifications * Measuring range: 0150 mm / 0-6 inches (0.15 m) * Resolution: 0.01 mm * Accuracy: 0 .02mm (&lt;100mm); 0.03 mm (&gt; 100200 mm) * Repeatability: 0.01 mm * Maximum measuring speed: 1.5 m/s, 6 in/s * Measuring system: Linear capacitive measuring system * Display: LCD display * Power supply: one 1.5 V alkaline lithium button cell battery, type LR44, capacity 180 mAh * Operating temperature: 5 - 40 41 to 104 < /p> Waterproof, dustproof, oil-proof the large 12mm x 31mm high contrast digital LCD display (0. 47 x 1.22) is quite easy to read. IP54 waterproof: splashing water, oil, dust resistance and automatic power on/off are convenient to use. REPLACING THE KEY BATTERY: - First step: use a screwdriver -Step 2: Remove the button cover in the direction indicated by the arrow and put the button cover back in place (positive side out). PACKAGE INCLUDES: 1 x Electronic Digital Brake Caliper 1 x plastic case 1 x additional button battery (extra ) 1 x mini screwdriver 1 x manual of use