Features Better Material: Mainly made from premium ABS material with a sturdy structure, not likely to deform and durable for long term using. Higher Accuracy: Supports easy switching between metric and British systems, the caliper has 0-150mm measuring range and high accuracy. Easy Carrying: Designed to have a compact and a light weight as well, the caliper tool also has a storage box for convenient carrying. Digital Display: Powered by the built in battery, the vernier caliper enables clear digital display to largely simplify your operation. Extensive Using: Allows for wide application in the measurement of length, depth, inner diameter, outer diameter and so on, very useful. Specification: Item Type: Vernier Caliper Product Material: ABS Measuring Range: Approx. 0 ~ 150mm / 0 ~ 5.91in Measurement Accuracy: ± 0.02mm Backup Battery: 1 x LR44 180mAh button battery, shipped with the battery. Power Supply Battery: 1 x LR44 180mAh button battery, shipped with built in battery.  Package List: 1 x Vernier Caliper 1 x Button Battery 1 x Storage Box Package List 1 x Vernier Caliper 1 x Button Battery 1 x Storage Box