Measurement & sensors
Digital ruler
A ruler calibrated with your bank card: measure in centimetres or inches with a cursor that slides right on the screen.
Turns your screen into an accurately calibrated physical ruler. Use a bank card as the calibration reference (8.56 cm) to correct your model's screen density, then measure with a sliding cursor in centimetres or inches.
Android 7.0+ · Free to download
Key features
Custom calibration using a bank card as a physical reference (standard 8.56 cm)
Vertical draggable cursor to measure any object placed on the screen
Centimetres (1 decimal) and inches (2 decimals) displayed at the same time
Calibration saved automatically: works next time without setting it up again
Visible millimetre marks for precise reading
Why use it?
Calibrate once with your bank card, then measure reliably from then on
Measure the width of an electronic component placed directly on the screen
Switch from centimetres to inches in one tap for measurements meant for a US template
Works offline
Most tools work without an internet connection.
No account
No sign-up, no email address required.
Free to download
Every tool is free. A one-time “Zero Ads” purchase removes the ads.
Digital ruler is part of Tooliz
Along with 41 other tools. Free to download, on Android.
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- Sound meterNoise level in decibels on a 6-level colour gauge.
Quentin (QuentinRG)Independent developer · Paris
Tooliz is an Android toolbox I built independently to bring everyday utilities together. Free to download, no account needed, designed to be useful and simple.
Discover all Tooliz tools