The Testo 512-1WC (0560 5126) 512 Differential Pressure and Flow Velocity Meter provides simultaneous pressure and flow measurements in one compact, versatile instrument. It offers two user-switchable units of flow, feet per minute (fpm) and meters per second (m/s). Eight different units of pressure can be selected: psi, inH2O, inHg, kPa, hPa, Pa, mmH2O, and mmHg. All readings are clearly visible on a large backlit display. The versatile 512-1WC Pressure Meter provides smoothing between 1 and 20 display refreshes (0.5 sec), yielding a sliding mean reading. Density compensation is built-in. A separate HOLD-MIN-MAX button freezes readings, and displays both flow and pressure extremes. The 512-1WC has a measuring range of 0 to 0.80 inH2O (0 to 2 hPa), and is ideal for measuring pressure differences at filters, and for carrying out pitot static tube measurements in air ducts at air flow speeds between 2 and 17.5 m/s.