The Micro-Electronic caliper use ruler measuring indicator is widely used in all kinds of gemstone measurement and precision measurement of small workpiece. The chip of the stainless steel thickness measuring caliper gauge indicator is elaborately designed which has high precision and quick speed. This caliper adopts premium stainless steel,very durable. Its power comes from battery,you do not need to worry about running out of power as soon as you replace it. The thickness measuring caliper gauge indicator is light, therefore the tool is portable and easy to use, you can carry it anywhere. Specification: Material:Stainless Steel Colour: Black Measuring Range:0-25 mm, reading value: 0.01 mm Accuracy:0.03mm Battery:1.5V Used for: Measure the inner diameter, diameter and thickness of objects. For example: rings, , jewelry, gems, etc. Features: 1. Easy reset. 2. Auto on/off. 3. Easily switch between metric and imperial systems. 4. LCD display, the screen display clear and easy to read. Package Contents: 1 x Electronic Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.