The VelociCalc® Air Velocity Meter 9545 is like having multiple meters for the price of one. This meter simultaneously measures and data logs several ventilation parameters using a single probe with multiple sensors. It measures velocity, temperature, and relative humidity; and calculates flow, wet bulb and dew point temperature. The 9545 model has a telescopic straight probe. Ideal for optimizing HVAC system performance, commissioning, plant maintenance, critical environment certification and duct traverses.