Ruler

Ruler is a precise digital measuring tool that transforms your Android device screen into an accurate ruler. Measure real-world objects directly on your screen with support for both metric and imperial units, DPI calibration for device-specific accuracy, and a measurement calculator for area and perimeter computations.

Key Features:

Digital Ruler Display
Place objects directly on your device screen and measure them with the on-screen ruler scale. The ruler displays clear, precise markings in your chosen unit system, providing measurements you can trust for everyday tasks. The visual scale is designed for maximum readability with well-defined major and minor tick marks.

Unit Switching
Toggle between centimeters and inches with a single tap. Whether you work with the metric system or imperial measurements, the ruler instantly converts its display to your preferred unit. The unit toggle button is conveniently located in the app bar for quick access.

DPI Calibration
Every device screen has a slightly different pixel density. The calibration feature lets you fine-tune the ruler to your specific device by adjusting the DPI setting. Calibrate once using a known measurement reference, and your ruler will provide accurate measurements tailored to your exact screen dimensions.

Draggable Measurement Markers
Set precise measurement ranges using draggable markers on the ruler. Position the start and end markers to define the exact segment you want to measure. The markers snap smoothly along the scale, and the measured distance is displayed clearly between them.

Measurement History
Save measurements you want to remember with a single tap. The history feature records your measurements with their values and units, creating a log you can reference later. Review past measurements anytime without needing to re-measure objects.

Measurement Calculator
Go beyond simple linear measurements with the built-in calculator screen. Compute area and perimeter from your measurements, useful for quick calculations when planning layouts, estimating material needs, or working on DIY projects.

Calibration Screen
Access a dedicated calibration interface where you can precisely adjust DPI settings. The calibration screen provides visual guidance to help you achieve accurate results, ensuring your ruler measurements match real-world dimensions.

Precision Display
Measurements are displayed with appropriate decimal precision, giving you the accuracy needed for detailed work. The numerical readout updates in real time as you adjust the measurement markers, providing immediate feedback.

Clean Visual Interface
The ruler interface features a clean, uncluttered design with high-contrast markings on a clear background. The layout prioritizes measurement accuracy and readability, with intuitive controls that do not interfere with the measurement area.

Lightweight and Instant
Ruler launches quickly and is ready to measure immediately. The app requires minimal storage space and no special permissions, making it a convenient tool you can keep installed for whenever a measurement need arises.

Ruler provides reliable, calibrated measurements right on your device screen. Download now and always have a precise measuring tool in your pocket.