Fangrui Product Details 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