What it does
This page explains the quickest way to print a receipt printer ruler, compare it with a physical ruler, and adjust DPI until the output matches the target length.
How to use it
- Open the POSRuler.com app.
- Choose inches or centimeters.
- Print the ruler and measure it.
- Adjust calibration and print again.
Why it matters
Thermal printers drift. A ruler makes that visible quickly, which is useful for POS teams, hardware setups, and anyone checking whether paper output still matches expectation.
Open the print ruler app to try it now.