Amprobe TMA-21HW Hotwire Anemometer with Temperature

(3 customer reviews)

  • 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)
  • Velocity m / s, f t / min, knots, km / hr, mph
  • Relative Humidity and Temperature Measurement
  • Data hold & Maximum / Minimum with Time stamp
  • Data Memory and Real function (99 sets)
  • 512KB auto data-logging capacity
  • Large backlit LCD display with 5 parameters
  • Auto Power ON / OFF setting
  • USB interface
  • Simple and safe to use
  • Included Accessories: Batteries, Hard Carrying case, USB Cable, and CD Software
SKU: 3730239 Category:


The Amprobe TMA-21HW 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.


Feature TMA-20HW TMA-21HW Best Accuracy
Air flow 0.10 m/s → 30.00 m/s
0.2 km/hr → 110.0 km/hr
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 %
Temperature – 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
Display: Triple display, 4 digit LCD reading.
Sampling rate: Once per second
Response time: < 2 seconds
Manual memory capacity: 5 X 99 sets. (direct reading from LCD display)
Power source: 6 X AAA Battery
Probe dimensions/weight: Wire length : 2.2 meter (7.2 ft)
Probe length : 1.2 meter (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)



Hot Wire Anemometers

No ball bearings and rotating parts results in a more durable anemometer.

What’s Included

  • TMA-21HW
  • Batteries (installed)
  • Hard carrying case
  • USB cable and PC software


Datasheet »
Product Manual »

3 reviews for Amprobe TMA-21HW Hotwire Anemometer with Temperature

  1. Savery

    Does everything quickly and accurately!

    This unit is very accurate and quick. Great product for the price and appears very well made. Highly recommend this to all.

    ✔ Yes, I recommend this product.

  2. smolaman

    This tool is a must have!!!

    The Amprobe hotwire is an excellent and reliable device thats quick acting and hassle free. Excellent for todays demanding jobs!

    ✔ Yes, I recommend this product.

  3. Athy

    One year use only -after that is just waste.

    This product is very good when is new, has a lot of fixtures, BUT after one year when the time is coming to calibrated is nightmare. Two different company send me notification that is not able to calibrated. Last year I bought a new one because of the was not possible the calibration.

    ✘ No, I do not recommend this product

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