Running out of gas in the middle of cooking can be incredibly frustrating. With our foolproof gas bottle gauge, this need never happen to you again. The innovative gauge works by measuring the weight of gas left in a 9kg bottle rather than the less effective gas pressure method. The lighter the bottle, the less gas you have. The easy to read scale shows you how much gas is left in your bottle. The Weber Q Gas gauge can be fitted to either the Weber Family Q (Q3000 series) or the patio cart.