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In the unlikely event
that an Amprobe Test
Tool requires warranty
service, any of our
local dealers are
authorized to replace
it, on the spot.
(note: $500 MSLP limit)
Amprobe® Test Tools www.Amprobe.com
Data Sheet
Hot Wire Anemometer
The 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 Heat / Ventilation, / Air conditioning
/ Refrigeration, wind flow and temperature in residential,
commercial and industrial air conditioning systems.
TMA-21HW
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, 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
Amprobe® Test Tools www.Amprobe.com
Data Sheet
General Specifications
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)
Operating Conditions 0°C ~ 40°C (32°F ~ 104°F) 10 ~ 80% R.H.
Power Source 6 X AAA Battery
Battery Life Approx. 10 hours
Dimensions 360.7 X 216 X63.5mm ( L14.2 X W8.5 X H2.5 in) with case
Weight 1043g ( 2.3 Lbs) with case
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)
Electrical Specification
Feature Range Accuracy
Air Flow 0.01 m/s ±3% of reading
0.1 km/hr ±1%FS
1 ft/min
0.01 knots
0.01 MPH
Air Flow Volume 0.001 CFM ±(1.2% rdg + 5 dgts) up to
0.001 CMM 400V Hz**
Temperature 0.1°C, 0.1°F ±0.5°C, ±0.9°F
Humidity 0.1%RH ±3%RH
Included Accessories Batteries, Hard Carrying case, USB Cable, and CD Software
©2010 Amprobe Test Tools. All rights reserved.
6/2010 TMA-21HW_DS Rev A
Amprobe® Test Tools
website: www.Amprobe.com
email: info@amprobe.com
Everett, WA 98203
Tel: 877-AMPROBE
Amprobe® Test Tools Europe
In den Engematten 14
79286 Glottertal, Germany
Tel.: +49 (0) 7684 8009 - 0
TMA-21HW Hot Wire Anemometer
