• 0 to 6,000fpm flow velocity
  • 0 to 99,999cfm volume flow
  • 0 to 100% RH
  • -22 to 482°F IR thermometer with 10:1 optic ratio
  • Calculates dew point & wet bulb temperature
  • Requires mobile device with Bluetooth 4.0
  • 2 year warranty

What's in the Box

  • 405i hot wire probe
  • 410i vane probe
  • 605i thermo-hygrometer
  • 805i IR thermometer
  • Batteries
  • Calibration cert
  • Case


The Testo VAC smart probe set is a combination of four instruments used to measure, balance, troubleshoot, and optimize ventilation systems performance. It includes two types of anememoters to give you the capacity to measure in-duct air flow and the flow from each vent. The IR temperature probe for surface temperatures will show you motor and electrical equipment conditions and an easy check of each outlet. The thermo-hygrometer will provide an assessment of the humidity and dew point concerns throughout the system.

Users can read the measurements using the Testo Smart Probes App installed on their Android (4.3 or newer) or Apple (iOS 8.3 or newer) smart device and calculate system enthalpy with air flow & RH probes. View RH & air flow measurements in-duct and at registers simultaneously.

The Testo Smart Probes App is a powerful and easy-to-use tool. It allows you to remotely read measurements from up to six Testo smart probes and easily document/report the results. All measurement data is displayed as instrument readings, tables, or graphs. The measurements can be quickly saved as PDF or Excel files. The App creates custom reports which can be saved and/or shared by email.