There are three colors (red, green, yellow) on a fire extinguisher. What do you mean by that?
The green area is the safe area, the yellow area danger zone and the red area failure areaThe pointer points to the Yellow Zone, indicating that the pressure of the drive gas in the extinguisher bottle is too high and there is a certain risk
If the pointer points to the red zone, it indicates that the drive air pressure is lower than the safety value. The fire extinguisher has lost the ability to fire and should be supplemented with pressure in timeOnly in green areas can be used properly
But note: between the 1.1.4 is allowed range. Too high, too low can not. Must be checked
