/max. High-precision vane probe, Ø 100 mm For example, to store individual readings for multi-point mean calculation or to start and stop measurement series for mean calculation over time, just tap the button to begin and end the measurement. Use this 4 inch high precision vane probe with the compatible Testo 440 multifunction measuring instrument to measure air velocity, volume flow and temperatures up to +158 °F. Pressing the button on the vane probe is a particularly useful feature to operate the measuring instrument.
values are displayed in the measuring instrument. Pressing the button on the vane probe is a particularly useful feature to operate the measuring instrument..