Features: brand new and high quality Gas Level Indicator and it will show you how much gas is left in your for tank. Never run out of Gas from now on. Measure your gas with this level indicator, simply attach it to your gas for tank cylinder with this magnetic. Safe & accurate reusable works on LPG propane & butane cylinders.Magnetic backing allows for easy reuse on exchange bottles. 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 show you when you are low on gas, before you run out! While you are using the BBQ, Save money by using more gas from each cylinder. Specifications: Material: Plastic Color: Black Package Weight: approx.30g Size: approx.6.3x10cm/2.48x3.93in Package Includes: 1Pc x Magnetic Gas Level Indicator note: Please allow 1-2cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you!