Principle of double pointer pressure gauge

The dual-pointer pressure gauge is composed of a single-pointer mechanical pressure gauge and a red pointer memory device. The red pointer shows the maximum pressure during the measurement and stays in this position to record pressure peaks.

Before use, manually turn the red pointer back to zero. When the pressure of the measured medium increases, both the black and red pointers will rotate and indicate the pressure; When the pressure decreases, the black pointer indicates the current pressure as the pressure of the measured medium changes, and the red pointer continues to stay in place to record the maximum pressure.