Never run out of gas again with the Avanti Magnetic Gas Bottle Level Indicator. Reliable and accurate, it simply attaches to the side of your gas bottle and is ideal for Butane (LPG) or Propane. Easy to use, it works automatically and actually shows you how much gas is left in your bottle while you are using your BBQ or camping stove. It is reusable and can be moved from one gas bottle to the next.