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Extech 407123 Heavy-Duty Hot-Wire Thermoanemometer with PC Interface

Extech  |   Mfr# 407123  |   Item# DO-10200-02

$439.99 USD/EACH

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Usually ships in 9 days.

  • Accurately measures airflow (cfm) or velocity plus temperature
  • Mini, telescopic probe ideal for duct and ventilation measurements
  • Telescopic probe extends to 3 feet (0.9 m)
  • Measure airflow down to 40 ft/min
  • Ideal for measuring in HVAC ducts and other small vents
  • Super-large 1.4" (36 mm) dual LCD display
  • Min/Max, Data Hold
  • Optional RS-232 interface and data acquisition software (10200-10) enables user to display and capture readings on a PC, and set time intervals
  • Optional datalogger (10200-20) allows user to capture up to 8000 readings and can be transferred to a PC

  • Telescopic probe extends to 4 ft L
This hot-wire anemometer displays air velocity and temperature or CFM/CMM and temperature simultaneously on the large, dual LCD. Average up to 20 air volume points for a mean calculation. Other features include built-in RS-232 serial port, min/max, data hold, and auto shut-off. Meter is ideal for duct and ventilation measurements. Increase logging capabilities to 8000 data points with data module 10200-20 (sold separately). Download data to a PC via RS-232 interface (sold separately).What's included: Complete with telescoping probe with 7-ft (2.1 m) cable, six AAA batteries and protective holdster.

Note: AC adapter not available for this model.
What's Included:
Six AAA batteries and carrying case.
Product Type Hot-Wire Anemometer
Range Air velocity:
40 to 3940 ft/min
0.2 to 20 m/s
0.5 to 45 mph
0.7 to 72 km/hr
1.0 to 31 knots
Resolution Air velocity:
10 ft/min
0.1 m/s
0.1 mph
0.1 km/hr
0.1 knots
Temp resolution 0.1°F/C
Accuracy Air velocity: ±3% of reading, or ±(1% + 3 digit) FS
Temp range 32 to 122°F (0 to 50°C)
Temp accuracy ±1.5°F (±0.8°C)
Model 407123
Qty/ea 1
Manufacturer number 407123
Brand Extech
Display dual-line, 4-digit LCD
Dimensions 2-13/16" W x 7" H x 1-1/3" D
(7.1 x 17.8 x 3.4 cm)
Power six AAA batteries (included)


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Questions and Answers

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2 Questions | 2 Answers
Displaying questions 1-2
  • Q:

    What is the size of the probe? I want to get an idea of the volumetric flow rate measurement. Thanks
    Asked on 3/31/2016 by Kam

    1 answer



      The probe is 17mm diameter at the widest point and 140mm long. It extends up to 7'.

      Answered on 3/31/2016 by Dan from Technical Support
  • Q:

    we do not use a duct velocity meter, hence inside velocity of the duct is not know .How do i select the meter and appropriate range .
    blower cfm 5000
    face velocity 21-28 m/s max 8-14 m/s low
    Duct size 4"-8"-10"-14"
    Asked on 8/6/2009 by sujit sharma from mumbai inida

    1 answer



      You would choose a meter based on the maximum velosity range and accuracy you need. With that in mind you may want to look into a meter like part number 10321-20.

      Answered on 8/7/2009 by Jen from Technical Support
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Product Reviews


by PowerReviews
Extech 407123 Heavy-Duty Hot-Wire Thermoanemometer with PC Interface

(based on 2 reviews)

Reviewed by 2 customers

Displaying reviews 1-2

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Results jump all over

By Lab Rat

from Grand Rapids, MI

About Me Lab Assistant

Verified Buyer


  • Easy To Use


  • Difficult To Use
  • Inaccurate
  • Poorly Calibrated
  • Too sensitive

Best Uses

  • In The Lab

Comments about Extech 407123 Heavy-Duty Hot-Wire Thermoanemometer with PC Interface:

When testing air flow in our hoods the slightest draft sends the numbers flying. It is next to impossible to get a steady result.

(3 of 3 customers found this review helpful)


Extech T/A

By Gary

from Chicago IL

About Me Service Technician

Verified Buyer


  • Durable
  • Well Calibrated


  • Inaccurate

Best Uses

  • In The Field

Comments about Extech 407123 Heavy-Duty Hot-Wire Thermoanemometer with PC Interface:

The reading bounces around too much when I know the air flows are stable. There should be more stability in the reading. It is easy to zero when needed. I like the protective cap for the probe tip. Very rugged. Just not stable enough for fine measurements around 100 fpm.

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