Place the following situations should stop using the pressure gauge:

1, limited only nail gauge in the absence of pressure, the pointer can not be returned after rotation limiting, nails, was not limiting, in the absence of the pressure gauge nails, the pointer value of zero over gauge tolerances specified.

2, The surface glass of pressure gauge breaking, or dial scale blurred.

3, Pressure gauge seal damaged or more than validity verification

4, pressure gauge leaked or pointer within the beat.

5, other defects affect the pressure gauge accurate instructions.