Online RulerWhen a Card Is Wider Than Your Phone
Turn your phone sideways and check whether the whole card edge fits inside the AR Ruler calibration area. The long edge of an ISO ID-1 bank card is nominally 85.60 mm. If that edge still extends past the usable part of the screen, calibrate on a larger display where you can see both ends.
- An ISO ID-1 bank card is nominally 85.60 mm wide and 53.98 mm high.
- The calibration area needs room for the full reference edge, including both corners.
- AR Ruler saves the calibration locally. It reads no card data and uses no upload or sensors for this step.
- Turn the phone sideways. If the page stays upright, check your phone's rotation setting and try again.
- Open the calibration control in landscape orientation and check how much of the screen the card can actually cover.
- Lay the card flat with its long edge parallel to the guide. Line up both ends of the guide with the card's corners.
- Save the scale, then place the same card against the ruler to check the span. Use a larger display if either endpoint is clipped or hidden.
Check the space you can see
The phone's outer width includes space beyond the part of the display you can use. The browser and page can also leave margins around the calibration guide. Hold the card where the guide appears and look for both corners. If the corners are hard to see, lift the card slightly and move it just below the guide while keeping the edge parallel. Compare the corners with the guide from straight above so the viewing angle does not shift their apparent positions.
Match the edge to the guide
Use the edge called for by the calibration control. The short edge takes less room, but it works as a reference only if the control supports that edge. Turning the card diagonally may put both corners on the screen while leaving them out of line with the guide. If you can only align one end, move to a larger screen and repeat the calibration there.
Check the scale after changes
A detected browser zoom or display change can make the saved calibration out of date. Check the ruler against the card again after changing zoom, switching displays, or returning to an orientation with a different amount of usable space. If the card no longer lines up with the expected span, recalibrate in the view you will measure in. Line up the object's near edge with zero and move the marker to the far edge.
Can I zoom out to make the card fit?
Zoom can change the size of the guide on the page. Set the zoom before calibrating and check that you can see both physical corners against the guide.
Does the card need to face up?
Either face works. You only need to see the outline, so you can keep the printed details facing down.
Can I use the same scale on a laptop?
Calibrate on the laptop display where you will measure. The saved scale comes from the screen and settings used for calibration.