Precision Measurement - Measurement Range: 0 - 6 inches / 0 - 150mm; Resolution: 0.01 inch / 0.1mm; Accuracy: 0.01 inch / 0.1mm. 4 Measuring Modes - Vernier caliper can measure internal and external diameter, depth, and step with two sets of jaws and a probe. Zero Setting Function - This digital caliper can be set to zero in any position on the scale, allowing convenient measurement of multiple parts of a single object without repeated repositioning. Inch/MM Conversion - Easily switch between inch and millimeter units by pressing the unit conversion button. Ideal precise measuring tool for household and DIY applications. Large LCD Screen & Auto-Off - Clear display for easy reading; automatically powers down after 5 minutes of inactivity to conserve battery life. Includes one LR44 button cell battery.