Inside and outside angle: This inclinometer can measure relative angle as well as absolute angle. Through the screen, you can directly know the angle of the item you are measuring, which is convenient and practical. Angle: the measurement range is 490, the angle measured in the LCD Will also Rotate when the inclinometer rotates. Magnetic bottom: there are three strong magnets with a diameter of 8mm / 0.3-0.3-0.3in, which is easy to attach to metal for measurement Application Scenarios: Digital Angle Finder is suitable for ceiling trim, angle measurement, wall corner measurement, construction of pipelines, building construction, metal processing, etc. Inside/outside angle: 1. Absolute measurement mode 2. Press the Calibrate key to reset to zero at any position and enter the relatively measurement mode. 3.Absolute Measurement and relative measurement mode conversion. In relatively measurement mode, long press 3Scalibrate key to enter absolute measurement mode. Specification: Material: Plastic Angle measurement range: 4 x 90 Resolution: 0.1 Accuracy: 0.3 Working temperature: 32~104F (0~40C) Working Humidity: 40% - 80% Packing List: 1 x Digital Angle Finder Product Size: 55 x 55 x 16 mm / 2.2 x 2.2 x 0.6 in Notes: Please allow some deviation 1-2cm in width due to manual measurement. Please bring two 3V CR2032 Button Batteries by yourself Customer Service: * We offer 100% refund or exchange if the product has any quality issues, you can buy with confidence. * We offer online customer service 24 hours a day, feel free to message us if you have any questions. Thank you for good communication * We promise to ship within 24 hours, and delivery time is 7-20 working days.