Easy to Use: The magnetic design ensures a quick and secure attachment to your propane tank, allowing for effortless installation and removal. you have to do is to open the magnetic gas residual test strips, place them on the gas hydraulic tank and wait about 10 minutes for the value to be displayed. High-Quality: Propane tank gauge level indicator are made of quality PET plastic, liquid crystal, soft magnetic, sturdy and solid. They are resistant to breakage, deformation, and bending, maintaining their color and shape even after prolonged use. Wide Application: Gauge tank indicators are easy to dismantle, small and , easy to store and take with you , without taking up too much space and are suitable for outdoor travel, camping, barbecues, boating, hiking, etc., which can meet your diverse needs. Accurate Measurement: Propane tank guage provides an accurate reading of the propane tank's fuel level, helping you avoid accidental shutdowns or overfills. Please note: the physical slightly color difference or difference, does not affect the use, please do not mind, thank you! Colour:Photo Color Material:pet Package Contents: 4x Propane Tank Level Indicator 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.