The differential pressure gauge is an intuitive instrument used to monitor the pressure difference between two points in a system. It can accurately display the pressure difference through a mechanical structure without the need for power supply. It is applicable to positive and negative pressure control in clean rooms, filter blockage monitoring, differential pressure in ventilation ducts, differential pressure detection in negative pressure wards, and various industrial fluid systems. It features a reliable structure, clear reading, convenient installation, and high stability, making it a key instrument for ensuring environmental safety and the normal operation of equipment.