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 levelMeasuring range:4x90Power supply:2XAAA batteries(not included)Specification: 0-400mmResolution: 0.1Accuracy: 0.2Operating temperature: -10C-+50CUsage: Used to measure the level, outer Angle and dip AngleColour:RedMaterial:aluminum alloyPackage Contents:1 x Digital FinderOnly 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.