What are the red and green yellow ones of a fire extinguisher?
If the pointer points to the red area, it means that the pressure in the extinguisher is small and can not be ejected. This indicates that the extinguisher is out of order. Please fill it up immediately or replace it.
If the pointer points to the yellow area, it means that the pressure in the extinguisher is too large to use, but there is a risk of explosion.
If the pointer points to the green area, it indicates that the pressure in the extinguisher is normal and can be used normally. You can see that the green area is the narrowest section of the three sections of red green yellow.
