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Digital environment meter:

Velleman DVM401: Digital Environment Meter

Velleman DVM401

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The Velleman DVM401 Digital Environment Meter (Temp/Hum/dB/Lum)

Use this meter to find the exact conditions in your environment. With the ability to measure temperature, humidity, sound, and luminosity, the Velleman DVM401 delivers everything you need for a quick read on your surroundings. Reads are displayed on a 3.5 digit LCD display. Measure temperatures up to 1400°F and humidity up to 95%RH.


For sound measurements, chose between A and C weighted and Hi or Lo dB. When measuring sound, high winds may interfere with reads so use the included wind screen if using the DVM401 in a windy environment. When measuring light, simply hold the DVM401 meter horizontal to the light source. See our downloads tab for recommended illumination in various environments.


The Velleman DVM401 is a complete set that comes with battery (9V), temperature probe (K-type), humidity probe, photo detector, and carrying bag. DVM401 meter features also include auto power off and both data and maximum hold functions.



  • Luxmeter:
    • Ranges: 20.00, 200.0, 2000, 20000Lux (x10 Lux)
    • Resolution: 0.1Lux
    • Accuracy: ± ( 5% + 10d )
  • Temperature measurement:
    • Ranges: -20.0°C ~ 200.0°C, -4.0°F ~ 200.0°F, -20°C ~ 750°C, -4°F ~ 1400°F
    • Resolution: 0.1°C / 0.1°F
    • Accuracy: ± (3% + 2°C)
  • Humidity meter:
    • Range: 25% ~ 95% RH
    • Resolution: 0.1% RH
    • Accuracy: ± 5% RH at 25°C
  • Sound level meter:
    • Ranges: Lo = 35 ~ 100dB, Hi = 65 ~ 130dB (frequency weighting : A, C)
    • Resolution: 0.1dB
    • Accuracy: ± 3,5 dB at 94 dB sound level , 1Khz sine wave
  • Power supply: 9V-battery (incl.)
  • Dimensions:
    • Unit: 9.9" x 2.5" x 1.3"
    • Photo detector: 4.5" x 2.4" x 1.1"
  • Weight:
    • Unit: 11.6 oz.
    • Photo detector: 2.8 oz.
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User manual
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 Warning: this product can expose you to chemicals which are known to the State of California to cause cancer, birth defects or other reproductive harm. For more information go to: www.P65Warnings.ca.gov/product