Review on Reliable Stainless Pressure Gauge for Compressor Hydraulic Testing & Inspection by Joseph Morris

later The sand filter gauge is used to read about 12psi. In the last two years the pressure has increased to 20 psi. A new fluid filled pressure gauge was installed and the pressure reading is normal at 12psi. The other sensor was from a pool store that only gave correct readings for a year and cost twice as much.