Multi-hole probes are fluid mechanics instruments designed to measure the flow velocity and pressure through direct measurement of the pressures at the probe tip, and then using the pressures to calculate a velocity. These probes measure flow velocity and pressure by interfering (as little as possible) with the flow in a particular and consistent manner. A one-time calibration of the probe at a known flow speed and angle, followed by processing of the raw pressure data provides a non-dimensional pressure coefficient map to which subsequent measured pressures are non-dimensionalized and compared. In this way, the unknown velocity vector, as well as the total and static pressure at the measurement location may be determined.

WTtech.CZ offers standard probe geometries straight and L-shaped. These can be manufactured with either conical or hemispherical tips. Conical tips are typically manufactured with an included angle of 60°. Standard construction material is stainless steel, giving the probes operating capability from -20°C – 450°C. Practically each probe is essentially designated by specifying the geometry fields. Some minor geometry changes from the standard probes can be easily accommodated. All standard probes include one standard calibration at a speed of customer’s choice (5 m/s – 320 m/s). Custom probes include one standard calibration at a speed of the customer’s choice if probe geometry permits.


• Determination of Three Components of Flow Velocity Plus Total and Static Pressure at Probe Tip

• Accurate Resolution of Velocity Vectors as High as 60° (5-Hole) or 70° (7-Hole) from Probe Axis

• Usable in Air and Water Environments

• Max Frequency Response up to 500 Hz, Depending on Pressure Sensors and Pneumatic Connections

• Flow Speeds from 5 m/s to 325 m/s, Mach 0.02 to Mach 0.95


• Standard Probe Tip Diameters as Small as 3.2 mm, with 1.6 mm Option

• Multiple Standard Probe Geometries

• Standard Manufacturing Uses Stainless Steel Components for Rugged Construction

• Hemispherical or Conical Probe Tips

• Long Probe Calibration Intervals, with Normal Operation