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. Apply Gas Level Indicator near the bottom of your tank, out of direct sunlight. The magnetic backing will adhere to the tank automatically. 2. Turn on the gas. The Gas Level Indicator works when the gas is on and you are grilling. Wait 2-5 minutes. 3. Read the level a. When tank is full and the gas level is above the GLI, no level will be shown. This is normal. b. When the gas falls within the range of the GLI, the color will change in at least one of the bars as shown. c. Under certain conditions, more than one bar may change color. The level is shown where the leftmost bar changes color. Package included: 2PCS Magnet Gas Level