Digital Rolling Ruler with LCD Display Key benefits — why you need it Accurate, repeatable measurements: Advanced microprocessor control and an accuracy encoder deliver reliable results with ±0.5% accuracy, reducing waste and rework. Versatile for many shapes and distances: Measures straight lines, circles, arbitrary curves, irregular surfaces and cylindrical diameters, so one tool handles tasks that previously required multiple instruments. Fast, user-friendly operation: Audible measurement confirmation, breathing-light indicator and unit switching make it simple to use in noisy or low-light conditions and speed up workflows. Long reach and memory: Measures up to 99 meters and supports a single-range measurement of 0–9 meters, with 10 stored history records to review past readings and perform accumulation/subtraction across datasets. Primary features Measurement modes: linear, circular, arbitrary curve, irregular surface, cylindrical diameter. Data handling: accumulation and subtraction across 10 gradient datasets; 10 history records available for recall and review. Display: clear LCD readout for immediate results. User aids: measuring sound and breathing-light indicator for confirmations; unit switching for flexible output. Range and accuracy: maximum distance 99 m; single-range support 0–9 m; result accuracy ±0.5%. Operating conditions: compact design rated for use from -10°C to 50°C. Performance and practicality Saves time by combining multiple measurement functions into one instrument, with on-device memory and simple controls for quick job-site decisions. Improves measurement consistency between operators thanks to electronic encoding and processor-controlled calculations. Built compact and portable for easy transport between sites and effective use in a wide range of ambient temperatures. Use scenarios Construction and site layout: Quickly measure long runs, circular layouts and pipe diameters; store repeated readings and perform subtraction/accumulation for cut lists and material estimates. Furniture and interior fitment: Accurately measure curves, irregular surfaces and cylindrical features when fitting countertops, trim or curved panels. Mechanical and plumbing work: Measure pipe diameters and complex surfaces, keeping a history of measurements for verification and assembly checks. What it solves Eliminates repeated manual calculations and reduces human error with digital encoding and stored datasets. Replaces multiple hand tools by combining curve, diameter and long-distance measurements in one device. Makes measuring faster and more reliable in noisy or dim conditions thanks to audible and visual confirmations. Specifications (concise) Modes: linear, circular, arbitrary curve, irregular surface, cylindrical diameter Memory: 10 history records; accumulation/subtraction across 10 gradient datasets Range: up to 99 m total; single-range 0–9 m Accuracy: ±0.5% Display: LCD User features: measuring sound, breathing-light indicator, unit switching Operating temperature: -10°C to 50°C Reliable, easy to operate and designed for varied measurement tasks, this digital rolling ruler brings accuracy, range and practical memory functions to professionals and DIY users who need consistent, repeatable results.