Meet the Gas Scale: a Bluetooth scale that lets you monitor how much gas you have left in any given cylinder. It has magnetic feet that firmly attach to your cylinder. The companion app lets you monitor gas consumption history, gas level, and gas leakage. The device is compatible with iOS and Android devices.
The Gas Scale detects gas leakage and alerts you. The device is lightweight, compact, and portable. You can find out more on Kickstarter.