[1]This product can safely and accurately measure the gas capacity, according to the gas temperature test, measuring the temperature range of -10 ℃~ 120 ℃. Will actually show you when you are low on gas, before you run out! [4]Works on LPG (propane) & butane cylinders [2]Save money by using more gas from each cylinder [3]Safe & Accurate & Reusable [5]Magnetic backing allows for easy reuse on exchange bottles, Manufacturer: Baeroprki