Empty Mark / butane gas Gauge

People often use butane gas without checking the remaining amount. There is no visual way of checking the remaining amount of butane gas unless by shaking or guessing through the weight. This design proposes a method of visually recognizing the amount remaining inside the gas container without using any tool by using the pressure difference occurring through the remaining amount inside the butane gas container. Using semi-transparent material that can withstand the pressure of gas, the two-tone color cylinder inside displays the change of color through the movement from pressure, thereby displaying the remaining amount of gas inside. If the color of the display text is gray, the amount of gas is full and it is empty when the color is red.