477-000T-AV is a convenient all-in-one kit includes digital manometer and pitot tube for balancing system air flows. It is small, light and easy to use. No set-up or leveling needed. Digital manometer reads from 0-1" w.c. with ±0.5% F.S. accuracy. The Series 477AV stores up to 40 readings in memory for later reference, with selectable English/Metric pressure, flow and velocity units that are visible on a large, backlit 0.4" LCD readout. Both audible and visual overpressure alarms and a "low battery" warning are standard features. An indispensable test kit for the plant engineer, industrial hygienist and HVAC technician.