1. Multi-Functional 3-in-1 Infrared Laser Rangefinder - Combines a laser rangefinder, a 5-meter tape measure, and a cross-hair mark in one tool, letting you measure high ceilings and hard-to-reach areas with a single touch. - The unique 3-in-1 design helps you measure large spaces efficiently and accurately. - Important: the tape measure function requires 2 AAA batteries, which are not included in the package. 2. High-Precision All-around Measuring Tool - Includes 6 precision measuring modes with error control within 1/16 inch: distance, continuous measurement, area calculation, volume calculation, Pythagorean two-point measurement, and Pythagorean three-point measurement. - Calibration function, reference change and unit setting provide flexible, convenient operation. 3. Innovative Safety Design - Built-in self-locking device locks the tape measure automatically when extended to the current measurement position, ensuring stable readings. - Press the unlock button to release and retract the tape smoothly, reducing the risk of hand injuries and improving usability. 4. Advanced Data Storage Function - Supports single and continuous measurement, area and volume calculations, and Pythagorean-based precise measurements to meet varied needs. - Powerful historical data storage stores up to 20 sets of measurement data for easy review and comparison, improving work efficiency and data management. Use scenarios - Home and office interiors: measure room dimensions, plan furniture layouts, or assess ceiling heights in spaces with limited access. - Renovation and construction: quickly compute areas and volumes for material estimates, and perform Pythagorean measurements for complex layouts. - Field surveys and reporting: save multiple measurements for project documentation, compare progress over time, and streamline reporting.