Fieldpiece Pressure Switch Tester

"Pressure switches are often out of calibration before they completely fail, and it is for a wide variety of reasons, all of which can cause the furnace to operate in an unsafe manner. The DDSM1 Draft Simulator from Fieldpiece creates a controlled vacuum to test pressure switches, so technicians can tell exactly when a pressure switch closes and opens.  This either proves that the switch is within specification, or identifies if the switch is starting to fail."