The hot ball probe is equipped with a telescope, which can be extended to a maximum length of 860 mm. With a diameter of just 3 mm, the probe is ideal for measurements in narrow, inaccessible places.
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Directly from the manufacturer

Temperature - NTC | Measuring range -20 to +70 °C |
|---|---|
Accuracy ±0.5 °C | |
Absolute Pressure | Measuring range +700 to +1100 hPa |
|---|---|
Accuracy ±3.0 hPa | |
Resolution 0.1 hPa | |
Velocity / Volume flow | Measuring range 0 to +10 m/s |
|---|---|
Accuracy ±(0.03 m/s + 5 % of mv) | |
: 0563 4403
testo 440 100 mm Vane Kit with Bluetooth®
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testo 440 16 mm Vane Kit
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testo 440 Air Flow ComboKit 1 with Bluetooth®
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testo 440 Air Flow ComboKit 2 with Bluetooth®
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testo 440 CO₂ Kit with Bluetooth®