How To Distinguish Between Vacuum Pressure Gauge And Pressure Vacuum Gauge?

Judging from the dial scale of the pressure gauge, the vacuum pressure gauge is easy to identify. The pointer and zero position of the pressure gauge in the idle state are at the rearmost side of the vacuum pressure gauge. There are two common layouts for the dial scales of pressure and vacuum gauges. One is like the picture above, where the pointer and zero are in the middle position in the idle state. The range of this pressure and vacuum gauge is -1bar~1bar. The other is like the picture below, where the pointer and zero are on the left, zero. There is also a negative pressure scale below the position. The positive pressure range of this pressure vacuum gauge is much larger than the negative pressure. The specific range is designed according to the usage scenario.