VelociCalc Multi-Function Ventilation Meters

The VelociCalc Series 9555 are portable, hand held, multi-function ventilation test instruments. These instruments are available with or without a differential pressure sensor and are designed to work with a wide range of plug-in probes. The probes allow users to make various measurements by simply plugging in a different probe that has the features and functions best suited for a particular application. They are designed to measure air velocity, temperature and humidity, (CO and CO2 requires additional probe). Calculations include air flow, heat flow, turbulence, wet bulb and dew point temperature.

The probes can be ordered at any time and include a data sheet with certificate of traceability. When its time for servicing, only the probe needs to be returned since all the calibration data is stored within the probe.

  • Best in class accuracy, especially in low flows
  • Includes telescopic probe to measure air velocity, temperature and humidity
  • Displays up to 5 measurements simultaneously
  • Optional "smart" plug-in probes, including CO2 and rotating vane probes
  • Large graphic display
  • Manual or continuous data logging
  • TRAKPRO downloading software included
  • Name test IDs meaningful to you
  • Bluetooth printer capability
  • Fast calibration and repair service - just send in the probe
  • Articulated probe version available (9555-A)
  • Multi-Function Meter w/pressure, no probes version available (9555-P)
  • Multi-Function Meter w/o pressure, no Probes version available (9555-x)


9555 VelociCalc 9555 Multi-Function Meter: with Straight Probe (Model 964), Pressure, Data Logging
9555-A VelociCalc 9555-A Multi-Function Meter: with Articulated Probe (Model 966), Pressure, Data Logging
9555-P VelociCalc 9555-P Multi-Function Meter: No Probes, with pressure, Data Logging
9555-X VelociCalc 9555-X Multi-Function Meter: No Probes, without pressure, Data Logging


  • HVAC commissioning and troubleshooting
  • Clean room certification
  • Testing and balancing
  • Ventilation evaluations
  • Thermal comfort studies
  • IAQ investigations
  • Process air flow testing

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