Pressure and vacuum measuring devices measure pressure to help ensure vacuum systems are working properly. They are used in a range of industrial and commercial applications, including water and wastewater, pulp and paper, oil and gas, or food and beverage. Digital pressure meters measure hydraulic or pneumatic pressure in HVAC systems, medical equipment, and machine tools. Manometers also measure low positive, negative, or differential air and gas pressures in dust collection systems and HVAC filter banks. Pressure and vacuum gauges monitor the pressure of air and noncorrosive fluids in pumps, filters, compressors, regulators, and boilers. Pressure and vacuum test plugs provide access to fluids and gases in closed systems and gather samples without opening or depressurizing the system. Pressure and vacuum transmitters, or transducers, transmit a continuous signal to collect data and send it to a monitoring device.