Stanless Steel Digital Calipers with Extra-large LCD Screen Measuring Scale Measuring Tool Brake Caliper one sliver oxide battery 1.5V for one year of continuous use. low battery warning by flashing dispal Non-contaction linear CAP measuring system Maximum measuring speed: 1.5m/sec or 60''/sec Take measurements from 0 to 6-inches, comes with 1-year warranty It can be used to measure piano and other small things