Gas level indicator with magnetic backing for gas cylinders. Attach it to LPG (propane) or butane cylinders to measure remaining gas. How it works Place the indicator on a clean area of the lower half of the cylinder. Turn on the gas and wait about 10 minutes to read the indicator. The reading uses seasonal columns: the left column is activated in winter, and the right column is activated in summer. It remains readable while you are using the grill. Key benefits Simple, clear way to monitor gas level and plan refills, reducing the risk of running out unexpectedly. Reusable design with a magnetic backing for easy reattachment on exchange cylinders. Compatible with LPG (propane) and butane cylinders, making it suitable for common grill setups. Comes with instructions for straightforward use and maintenance. Attributes and performance Function: measures remaining gas level with a seasonal column indicator (winter left column, summer right column). Compatibility: LPG (propane) and butane cylinders. Material: magnetic backing for easy reuse; designed for outdoor gas grills and exchange cylinders. Efficiency: helps you optimize gas usage and avoid wasted gas by providing a readable level before grilling. Use scenarios Home grilling: attach to your propane or butane cylinder to track gas so you know when to refill or before an outdoor barbecue. Camping and outdoor cooking: use with exchange cylinders to ensure you have sufficient gas for a full cooking session and avoid midmeal shortages. Small catering or gatherings: monitor gas levels on multiple cylinders to schedule swaps ahead of time, keeping grilling on track without surprises.