Main Features: Made of strong plastic carbon fiber composites, lightweight and durable Four way measurement: inside diameter, outside diameter, depth, step Zero setting in any position With large LCD display, easy to read Minimum scale to read is 0.1mm / 0.01 inch An ideal tool for a broad range of industrial and automotive applications Measuring Range: 0 - 150mm / 0 - 6 inch Package Contents: 1 x LCD Digital Caliper . f the digital numbers shows incorrect number while using, pls don't worry, please change a new battery, it will work fine again, it's not a quality issue