TSI VELOCICALC® Air Velocity Meters are like having multiple meters for the price of one. These meters simultaneously measure and data log several ventilation parameters using a single probe with multiple sensors. They measure velocity and temperature and calculate flow. The VELOCICALC® Air Velocity Meters come equipped with telescopic straight probe or articulated probe. They are ideal for optimizing HVAC system performance, commissioning, plant maintenance, critical environment certification and duct traverses.