describe:100% brand new and high qualityFrom now on, we will never run out of natural gas. Use this liquid level indicator to measure your gas, just use this magnetic gas level indicator to connect it to your gas tank cylinder, and it will show how much gas is left in your gas tank.feature:This product can safely and accurately measure the gas volume. According to the gas temperature test, the measuring temperature range is -10~120.When your fuel is low, it will actually tell you before you run out!Work when you use the barbecueSave money by using more gas from each cylinderSafe and accurateReusableSuitable for liquefied petroleum gas (propane) and butane gas cylindersMagnetic backing makes it easy to reuse on replacement bottlesAttached noteMaterial: PET plastic + liquid crystal + soft magneticColour: Blackinstruct:1. Place your gas level indicator in a clean area on the bottom half of the gas cylinder.2. Turn on the gas and wait 10 minutes, then you can read your indicator.3. The bar on the left will be active in winter, and the bar on the right will be active in summer.Size: 10*6.2cm*0.1cm/3.94"*2.44"*0.04"Package includes:1*Test card