Printable Ruler Generator

Choose paper, units, ruler length and tick density, then create a 1:1 printable ruler with built-in 50 mm and ID-1 card verification marks.

Paper

Orientation

Ruler units

Lengthmillimeters

Tick density

Paper—

Ruler length—

Print scale100%

Verification50 mm + card

Print at Actual size / 100%. Disable Fit to page, Shrink oversized pages, or automatic scaling. After printing, verify the 50 mm line or the 85.60 × 53.98 mm card outline before using the ruler.

Device diagnostic workflow

Start with a functional check, measure only what the browser can actually expose, then retest after one change.

ConnectChoose the actual browser-visible device or grant permission when required.

TestConfirm basic signal, input, output, preview or display behavior.

MeasureUse browser-exposed levels, timing, resolution, FPS, axes or event data.

DiagnoseCompare the symptom with the focused diagnostic rather than guessing from one number.

RetestRepeat after changing the device, cable, permission, browser or system setting.

Pre-call Mic Webcam Keyboard Mouse Gamepad Display Permissions

Browser boundary
These tools observe browser APIs and local media/event streams. They cannot certify hardware condition, bypass denied permissions, or expose measurements the browser/OS does not provide.

Use the connected diagnostic workflow

Connect or select the device, confirm the basic function, inspect the browser-visible measurement, then open a focused diagnostic only when the symptom calls for it.

Browser-local does not mean laboratory measurement

These pages can report Web API data such as events, stream settings, frame timing and audio samples. They do not certify hardware condition or bypass browser and operating-system limits.