The dual needle and dual tube differential pressure gauge is suitable for measuring two identical or different pressures and can indicate the two measured pressures and the difference between the two pressures separately. The products are divided into YCS ordinary type and YCSH anti-corrosion type. YCS ordinary type is suitable for measuring non corrosive media, while YCSH anti-corrosion type can be used in corrosive media and environments.

The instrument consists of two independent measurement systems and indicator devices. The measurement of pressure is achieved through the elastic deformation of the pressure measuring element, which generates corresponding displacements at the ends of two pressure measuring elements (spring tubes), and is amplified by the transmission of the tension rod transmission mechanism. The measured values are indicated on the dial by the red and black pointers fixed on the gear shaft, and the middle small dial displays the difference between the two pressures.