Digital Goniometer Electronic 3 In 1 Bubble Level Box Woodworking Tools Electronic Angle Ruler Backlight Protractor Inclinometer 3 In 1 Level Box Digital Woodworking Electronic Protractor Inclinometer Backlight Horizontal Angle Measuring Instrument 1.Great Repeatability and Consistency: This angle gauge is designed with accuracy of 0.2 and the resolution is 0.05. The measuring range: 0 to 360 (4*90). Display unit: DEGREE only. It provides convenience in woodworking, construction, machinery, telecommunications, automobile etc. It is pre-calibrated in factory. 2.Strong Aluminum Framework&Magnetic Flat Base: The digital angle gauge applied sturdy aluminum alloy instead of plastic for the main framework. Itll provide years usage. 3.Two Measuring Mode: Checking the true level. Checking the relative angle between two surfaces. 4.Lower Power Reversible LCD Display with ERROR indicator: The Digital Angle Gauge has a large LCD display with backlight, which only needs one battery for providing accurate, quick and clear measurements and even you can easily read in dark environment. If the digital angle gauge is used in an incorrect position (e.g. tilts diagonally over 30 degree), display will tell ERROR to make sure that use is getting the accurate measurement. 5.Easy Battery Installation: You can install battery easily and need no screwdriver. WIth 2* AAA battery, the digital angle gauge works 50 hours averagely. *Automatic shut-off after 5 minutes. Specifications Powerful built-in magnets on the base secures the attachment to any iron surface Easy-read large readout LCD display with backlight Fast and accurate measurements Accuracy: 0.2 degrees Resolution: 0.05 degree Repeatability:0.1 degree Working temperature:-10-50C Measuring range: 4*90degree Tips When the device tilts diagonally over 30 degrees, it will display ERRO instead of an angle. Because in this situation, this angle gauge is not accurate as it shuold be _x000D_