Here is a handy device that lets you know how much gas you have left in your gas cylinder. The Gas Scale has magnetic feet that attach firmly to your cylinder. There is a companion app that lets you connect to the scale wirelessly and monitor gas level, consumption history, and gas leakage on your smartphone.
The Gas Scale is compatible with iOS and Android devices. It can be adjusted to fit different types of cylinders. Like what you see? You can find out more on Kickstarter.