Differential pressure gauge

The utility model relates to a differential pressure gauge, which comprises a gauge case, a gauge door, a pointer and a differential pressure sensor, wherein the differential pressure sensor comprises a tubular shell, both ends of which are provided with connecting screw threads, a piston is arranged in the shell, a permanent magnet sleeve is fixed on the piston, a restoring spring is arranged between one end of the piston and the shell, the shell is transversely arranged on the rear lower part of the gauge case, and is fixed on the gauge case, a permanent magnet is fixed on the lower end of the pointer, and the permanent magnet and the permanent magnet sleeve fixed on the piston are formed into a permanent magnet kinematic pair. The utility model has the advantages of simple and compact structure, sensitive and reliable operation, wide differential pressure measurement range and long service life, and is an ideal substitute product for conventional differential pressure gauges.