Multifunctional digital protractor with metric (mm) and imperial (inches) ruler edge and an accurate digital display. It can measure both angle and length. Horizontal and vertical spirit levels help you check and calibrate the setup. Note that the levels are not displayed on the LED, but assist in determining alignment. Key benefits - All-in-one angle and length measurement: combines a ruler edge with a digital protractor for quick, precise readings in one tool. - Precise and versatile angle measurement: 0-360 degree range for inner, outer, and contrast angles, with accuracy of ±0.5°, and a resolution of 0.05°. Switch between degrees and minutes to meet different precision needs. - Easy data capture and repeatability: hold function freezes the current measurement for easy recording, and a lock angle function helps maintain accuracy during use. - Long battery life and clear display: built for extended use with more than 2000 hours of operation; automatic shut-off saves power; large LED display for easy reading in various lighting conditions. - Calibration aid: horizontal and vertical spirit levels assist with setup and alignment, improving workflow in projects that require precise angles. Specifications and features - Measurement range: 0-360° for inner, outer, and contrast angles - Accuracy: ±0.5°, Resolution: 0.05° - Units: metric (mm) and imperial (inches) - Functions: angle measurement, length measurement, hold data, lock angle - Display: large LED readout - Power: long-lasting battery with automatic shut-off - Calibration aids: horizontal and vertical spirit levels (not displayed on the LED) Practical applications - Woodworking and cabinet installation: align frames, doors, and drawer fronts with precise angles and repeatable measurements. - Construction and carpentry: set bevels, miters, and joints quickly; transfer angles from drawings to on-site work. - Drawing and layout: capture exact angles and lengths for layout lines, then freeze measurements for accurate tracing. This digital protractor delivers dependable angle and length measurements with a straightforward interface, long battery life, and practical calibration aids to support accuracy in woodworking, construction, and drafting projects.