TMA-20HW Hotwire Anemometer

This indoor air quality anemometer eliminates the use of bearings and rotating parts, providing good and stable accuracy of all measurements

This product is obsolete and has been replaced by:
TMA-21HW Hotwire Anemometer with Temperature

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The Amprobe TMA-20HW Hot Wire anemometer technology eliminates the use of bearings and rotating parts. Because of this fact the meter is durable and provides good and stable accuracy of the measurements. It is used for indoor air quality and HVAC/R technicians measuring heating, ventilation, air-conditioning, refrigeration, wind flow and temperature in residential, commercial and industrial air conditioning systems.

The TMA-20HW comes with six (6) AAA batteries (installed), user's manual, and a hard carrying case.



• Highly accurate thermometer with 0.1% basic accuracy for precise measurements
• Fast response telescopic probe for use in hard to reach places
• Air Flow Volume (CFM, CMM)
• Instant, Avg, 2/3 Vmax Flow Measurements
• Velocity m/s, ft/min, knots, km/hr, mph
• Data hold & Maximum / Minimum with Time stamp
• Data Memory and Real function (99 sets)
• Large backlit LCD display with 5 parameters
• Auto Power ON / OFF setting
• Simple and safe to use
• Included Accessories; six (6) AAA batteries (installed), hard carrying case





Air Flow

0.10 m/s - 30.00 m/s
0.2 km/h - 110.0 km/h
10 ft/min - 6000 ft/min
0.10 knots - 59.0 knots
0.12 mph - 68.00 mph

± 3% of RDG, ± 1% FS

Air Flow Volume

0.000 CFM → 999900 CFM
0.000 CFM → 999900 CMM

± 3%



- 4°F - 140°F
(-20°C - 60°C)

± 0.9°F (± 0.5°C)

Relative Humidity


0.0% - 100%

± 3%

Data Logging and USB Interface



Wet Bulb / Dew Point




Triple display, 4 digit LCD reading.

Sampling Rate

Once per second

Response Time

< 2 s

Manual Memory Capacity

5 x 99 sets. (direct reading from LCD display)

Power Source

Six (6) AAA batteries

Probe Dimensions

Wire Length

2.2 m (7.2 ft)

Probe Length

1.2 m (3.9 ft)

Probe Diameter of Tip

15.0 mm (0.59 in.)

Probe Diameter of Base

28.0 mm (1.1 in.)

Probe Weight

165 g (0.36 lbs)

For complete specifications please download the product datasheet under the “Resources" tab.