Review on Forney 75554 Pressure Bottom 4 Inch by Robert Aiono

I purchased these products for use in a custom manifold I was building. Each device was placed downstream of the Ingersoll-Rand regulator to display the barometric pressure for that individual line. After pressurizing the system and beginning to calibrate each air line, I noticed that the Forney gauges were at least 10psi off the expected level. After some basic debugging, I was able to determine that EVERY Forney sensor was out of calibration!