Feature:♥ 1. It has 4 measurement methods: outer diameter, inner diameter, depth and step.♥ 2. Press the Imperial/Metric button to toggle the reading between imperial and metric measurements. ♥ 3. Clear LCD screen: The large and easy-to-read LCD display helps you get precise results quickly and easily♥ 4. If you find the readings are not accurate, please slide the LCD screen to the left end (0 on the scale), and then press the zero button. ♥ 5. The digital caliper is only for household measurement, such as jewelry, gadgets and other household