Features: Solar power metal digital calipers with double power type ensures stable outdoor use and eliminates frequent battery changes. Constructed with erosion resistant steel, it features a clear LCD display for precise 0.01mm measurements and includes a easy carry storage case. Ideal for engineers, technicians, and enthusiasts requiring high accuracy tool in workshops or fieldwork. Perfect for mechanical workshops, woodworking projects, and outdoor environment where durability and accuracy essential. Its 150mm measuring ranges and lightweight design makes multifunction for small parts, tool, and active professional applications. Attention: 1. If the battery is not placing , it needs to be constantly exposes to strong light to display. 2. The product not include button batteries and customers need to purchase 3V batteries themselves. Specifications: Component : steel, ABS shell Power supply way : solar power supply + button battery Length: about 236mm/9.29inch Package Includes: 1xDigital calipers 1xScrewdriver 1xStorage Box note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the differences between different monitors, the picture may not reflect the actual colorful of the item.