The LF32 is an adjustable differential pressure switch capable of detecting miniscule changes in pressure do to its size and proven design. The air pressure switch set point or switching point can be field adjustable with out the need of a manometer by simply using the adjustment knob and the built in calibrated visual scale. This air flow switch is equip with a clear cover that not only protects the adjustment knob to be move involuntary but also provides class IP54 protection.