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<br><br>Please note: the physical slightly color difference or difference, does not affect the use, please do not mind, thank you! Never run out of Gas from now on. Measure your Gas with this level indicator, simply attach it to your gas tank cylinder with this magnetic Gas Level Indicator and it will show you how much gas is left in your tank. Reusable Works on LPG (propane) & butane cylinders Colour:Photo Color Material:pet<br><br>Package Contents: 2 x Gas Level Indicator<br><br>Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.