Testo hotwire & vane anemometers, multi-function IAQ Meters, CO & CO2 meters, micromanometers, tachometers, thermohygrometers, IR and digital thermometers, boroscopes
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Brandt Instruments Distributing Testo

Testo 425 Hot-Wire Thermal Anemometer, Air Flow Meters using Hot Wire Technology

testo 425 Hot-Wire Thermal Anemometer

The testo 425 hot-wire thermal anemometer has a telescoping probe. It displays air flow, volume flow (cfm) and temperature measurements. The volume flow can be easily calculated by entering the duct measurements into the 425.  Users can also easily switch over to view the current temperature values.

General Features:

  Temperature, flow and volume flow measurement
  Multipoint and timed mean point calculations
  Hold button to freeze readings
  Clear backlit display
  Displays Min/Max values
  Probe extends to a maximum 33 inches
Testo 425 Hot Wire Thermal Anemometer

testo 425 Thermal Anemometer Specifications

Sensor Thermal hot-wire air velocity, NTC temperature
Measuring range 0 to +4000 fpm, 0 to +20 m/s
-4 to 160 °F, -20 to +70°C
Accuracy ±6 fpm +5% of reading
±0.03 m/s +5% of reading
±0.9 °F (32 to +140 °F)
±1.3 °F (remaining range)
Resolution 2 fpm, 0.01 m/s, 0.1 °F
Operating Temperature -4 to 122 °F, -20 to +50°C
Weight 10 oz, 285 grams
Dimensions (LxWxH) 7 x 2.5 x 1.6 inches, 182 x 64 x 40 mm
Battery 9 volt
Battery Life 20 hours, typical
Housing ABS, TopSafe: Protection class IP65
Warranty 2 Years

testo 425 Kits & Accessories

0560 4251 425 Hot-wire anemometer, manual, battery, calibration certificate
400563 4251 425 Anemometer Kit:
0560 4251 Meter
0516 0210 Soft Carrying Case
0516 0210 TopSafe Clear Protective Case
0516 0210 Soft Carrying Case

Testo 425 Hot Wire anemometer used to measure duct velocity
Testo 425 Hot Wire Anemometr in use mesuring duct velocity

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    18568 Oak Grove Parkway 
    Prairieville, LA  70769 
Phone: 225-673-6776
    Fax: 225-673-6725

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