1, absolutely - for the function, can be used directly on the battery without correction; 2, 360 measurement; 3, with numerical retention function; 4, relative measurement and absolute-pair measurement conversion; 5, when the level is inverted, the Angle reading of the liquid crystal display automatically turn upward, which is easy to read the Angle; 6, LCD with backlight function, easy to use at night; 7, the product with Angle and mm /1 meter difference display function, without complex conversion; 8, the appropriate size, convenient for users to carry, but also to meet the diversity of measurement. name: 400mm digital level Measuring range:4x90 Power supply:2XAAA batteries(not included) Specification: 0-400mm Resolution: 0.1 Accuracy: 0.2 Operating temperature: -10C-+50C Usage: Used to measure the level, outer Angle and dip Angle Colour:Red Material:aluminum alloy Package Contents: 1 x Digital Finder Only the above package content, other products are not included. Note: Light reflection 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.