Service Terms & Metrology Accuracy Disclaimer
Terms of Use & Metrology Disclaimer
Review the service terms, display calibration responsibilities, optical parallax limitations, acceptable use rules, and screen care guidelines for using OnlineRulerPlus.com.
Last Updated: November 14, 2026
01 · General Terms
What are the terms of access for Online Ruler Plus?
By accessing and using OnlineRulerPlus.com, you agree to be bound by these Terms of Use. Online Ruler Plus is provided free of charge as a browser-based utility for personal, educational, design, and general reference measurement. The software, user interface design, and documentation are provided on an "as is" and "as available" basis without warranties of any kind, whether express or implied, including implied warranties of merchantability or fitness for a specialized industrial or clinical purpose.
02 · Metrology Scope
What are the accuracy limitations of an online screen ruler?
The physical accuracy of any on-screen ruler depends on user-performed display calibration, operating-system HiDPI scaling, browser page zoom, and viewing angle (cover-glass parallax). While Online Ruler Plus uses exact mathematical constants (1 in = 25.4 mm per NIST/BIPM and ISO/IEC 7810 ID-1 = 85.60 × 53.98 mm), web browsers cannot independently read physical monitor dimensions without user verification. Never rely on a browser screen ruler for medical dosing, structural engineering, legal trade metrology, or safety-critical machining where certified calibrated physical calipers are required.
03 · Display Safety
How should you protect your screen when measuring objects?
LCD, OLED, Mini-LED, and anti-reflective coated glass panels on laptops, desktop monitors, tablets, and smartphones can be scratched or damaged by excessive pressure or sharp metallic burrs. When holding physical objects—such as machine screws, metal hardware, jewelry, coins, or tools—against your display to align with the online ruler workspace, hold the item lightly without pressing into the panel, or place a thin sheet of clear protective film between sharp metal edges and the display glass. Online Ruler Plus assumes no liability for hardware damage resulting from object handling.
04 · Intellectual Property & Acceptable Use
How may OnlineRulerPlus.com content and tools be used?
All original source code, measurement guides, calibration workflows, and interface elements published on OnlineRulerPlus.com are protected under applicable copyright and intellectual property laws. You may use the online ruler tools and reference charts freely for individual, classroom, workshop, and studio tasks, and link to our canonical pages cleanly. Automated bulk scraping, unauthorized mirroring or framing inside deceptive wrappers, or interfering with site delivery infrastructure is prohibited.
05 · Advertising, External Links & Updates
How are third-party advertisements, links, and term updates governed?
OnlineRulerPlus.com may display clearly labeled third-party advertisements (such as Google AdSense units placed strictly outside interactive measurement controls) and link to external standards organizations (NIST, BIPM, ISO, W3C) for user verification. We are not responsible for the content or privacy practices of external websites; please review our Privacy Policy for advertising and cookie controls. We may update these Terms of Use as standards or site capabilities evolve; continued use constitutes acceptance of the posted terms. Questions may be sent to [email protected].