PRECISION AND ACCURACY - The measuring range of stainless steel vernier calipers is 0-150mm/0-6, and the accuracy is 0.005(0.13m), 0.01mm. The attached locking screws prevent any accidental sliding, ensure the specified position and you get error-free measurement results. TWO MEASURING MODES - The 6 inch(0.15m) stainless steel digital calipers 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 wasting time finding different tools to measure SAE or metric parts. MORE MEASURING POSSIBILITIES - 150mm vernier caliper has two outer jaws, depth measuring blades and slide rule maintenance. Measuring outer and inner diameter (holes, slot, etc.) as well as measuring depth and step. It is widely used in industrial and automotive, professional, home and office measurement fields. HIGH QUALITY MATERIAL & LARGE LCD DISPLAY - Stainless steel construction allows the digital micrometer to slide smoothly, ensures sturdiness and durability, long service life, easy storage and transportation. Finely polished IP 54 grade stainless steel can block splashing water and dust. Large high-resolution LCD display helps you get accurate results quickly and easily. AUTO-OFF & WARRANTY - automatic shut-off to save battery life after 5 minutes of inactive operation. The digital brake caliper with battery box comes with a pre-installed battery (1.5V button cell) and a replacement button