measure gauge and it will show you how much is left in your bottle Always stay prepared with accurate measure Measure your with this measure gauge, simply attach it to your for bottle cylinder with this This product can safely and accurately measure the capacity, according to the temperature, measuring the temperature span of 10 C~120 C Safe & accurate works on bottle backing allows for easy repositioning on exchange bottles Will indicate when levels run low, before depleting the supply! While using the BBQ, save money by utilizing more from each cylinder, Manufacturer: Kelisdi