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AN25: Heat Index Anemometer

Compact indoor/outdoor meter for measuring up to 7 environmental parameters

View Datasheet > AN25


Extech’s AN25 pocket-sized Heat Index Anemometer Pen not only measures Air Velocity, but also monitors Heat Index during hot humid days to prevent heat stroke during outdoor activities, sporting events or, indoor workplace. Its pen-sized design makes it convenient to fit into your pocket and carry it wherever you go. Complete with CR2032 battery.

Additional information

Air Velocityft/min

Range: 80 to 4920ft/min Resolution: 0.1ft/min, 1ft/min (>1000ft/min) Accuracy: ±3% FS


Range: 0.4 to 25m/s Resolution: 0.1m/s Accuracy: ±3% FS


Range: 1.4 to 90.0km/h Resolution: 0.1km/h Accuracy: ±3% FS


Range: 0.9 to 55.9mph Resolution: 0.1mph Accuracy: ±3% FS


Range: 0.8 to 48.6 knots Resolution: 0.1 knots Accuracy: ±3% FS

Relative Humidity

Range: 5.0 to 95.0%RH Resolution: 0.1%RH Accuracy: ±3% FS

Wet Bulb

Range: 5 to 122°F (-15 to 50°C) Resolution: 0.1°F/°C

Dew Point

Range: -103 to 122°F (-75 to 50°C) Resolution: 0.1°F/°C

Heat Index

Range: -31 to 401°F (-35 to 205°C) Resolution: 0.1°F/°C


Range: -20.2 to 130°F (-29 to 54.5°C) Resolution: 0.1°F/°C

DImensions / Weight

6×1.6×0.7" (152x40x18mm) / 2.1oz (60g)

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