High precision on-screen ruler for horizontal and vertical measurements in centimeters, inches, pixels and user defined custom units. Screen wide movable ribbons for easier horizontal and vertical measurement like a caliper and fine measurement buttons for accuracy. Diagonal (hypotenuse) display with measurement and angle calculation. Annotate with notes & drawing overlays with digital ink. On PCs there is also the ability to make simple calculations on board. (only for Windows 10 version 1607 or higher) Fully customizable, with colors and user defined layouts and scale. Load blueprints, designs, screenshots or drawings image files as background to take measurements. Take advantage of custom unit (one of the BEST features of the app) and take measurements of any scale. You can also use device camera to capture objects, designs, blueprints or drawings as background and measure with rulers or ribbons. Full-screen capability on desktop. Theme aware and customizable, supports both dark and light themes. Calibratable device screen for ultimate precision for all devices including desktops. Free, ad-supported. Windows 10 version 1803 supported. Windows 10 version 1809 or higher recommended.