The TT 550 Series hand-held Micromanometer is setting the standard in pressure and velocity measurement with a resolution of 0.01 Pascal and 0.01 m/sec. With its unique sensors, modern technology and programmable auto zero facility, it is possible to have two Micromanometers in one, by simply selecting the sensitivity mode from the user menu. Up to three Pitot tube factors can be stored. With air density correction and area setting, true velocity and volume readings can be measured with an accuracy of ± 1% of reading ± 1 count. A maximum of 2500 readings can also be stored and downloaded to a PC or thermal printer. Other features include back light display, auto switch off, real time recording and auto ranging with a pressure range of 0.04 to 5000 Pascals.