GUANGZHOU Practical Propane Butane LPG Fuel Gas Tank Level Indicator Magnetic Gauge Bottle Gas temperature card Black

This product can safely and accurately measure the gas capacity, according to the gas temperature test, measuring the temperature range of -10 C~ 120 C. ♥Will actually show you when you are low on gas, before you run out! Works while you are using the BBQ Save money by using more gas from each cylinder Safe & accurate Reusable Works on LPG (propane) & butane cylinders Magnetic backing allows for easy reuse on exchange bottles Comes with instruction ♥Instructions: 1.Place your Gas Level Indicator on a clean area on the lower half of the cylinder. 2.Turn on the gas and wait 10 minutes before you can read your Indicator. 3.In the winter the bar on the left will be active, and in the summer the bar on the right will be active.