Description: - Will actually show you when you are low on gas, before you run out! - Works on LPG (propane) & butane cylinders - Magnetic backing allows for easy reuse on exchange bottles - Winter and summer readings - Works while you are using the BBQ - Reliable, reusable and accurate - Save money by using more gas from each cylinder INSTRUCTIONS FOR USE 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 the 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 Package Included: 2x Magnet Gas Level Indictors