Er der gas?

Determine the gas level in your 11kg gas bottle using this app.

Easy to use:
  1. Press the start button.
  2. Hold the phone's microphone to the gas bottle (about the middle of the bottle).
  3. Hit the knuckles hard on the bottle's wrapper.
  4. Wait for the measurement to finish.
  The amount of gas remaining can then be read on the level meter.