Electronic Plastic Carbon Fiber Composite Digital Caliper and Calliper Gauge 1. Made of extra strong carbon fiber composite,lightweight and portable. 2. Large LCD display for easy reading. 3. One 1.55V SR44 battery can last about 12 months. 4.. Can be used to measure magnetic objects. Free of hurting when measuring. 5. Zero setting at any position 6. Metric/inch system conversion at any position 7. Manual ON/OFF or auto power off 8. Range: 0 ~ 150 mm/0-6inch Resolution: 0.1 mm/.01inch or 0.01mm/ 0.0005" Accuracy: 0.2 mm/.01inch