UV-C Irradiance Meter


NIST traceable, hand-held UV light irradiance meter with an integral sensor. Compact and durable for single-handed use.

  • Measure UV in the wavelength range of 246nm – 268nm
  • Measurements are shown in mW/cm2
  • Supplied with certificate of calibration

Typical applications include monitoring drop off of UV bulbs and tubes and transmission testing of PPE, screens and guards.

5 in stock (can be backordered)



  • Measurement of UV-C irradiation level to determine the time to achieve a dose necessary to inactivate (kill) specified micro-organisms.
  • Monitoring drop off of UV-C light irradiance during the operating life of UV-C germicidal bulbs and tubes.
  • Determination of UV light transmission (%) of transparent materials such as glass, plastic and window tinting film.
  • Checking the comparative performance of UV blocking guards, screens, clothing and eye/face protection.
  • Leak checking UV-C disinfection cabinets, conveyors and systems.


The sensor consists of a Silicon Carbide (SIC) photodiode chip and a UV filter. It is completely insensitive to UV and visible light longer than 280nm and infrared radiation. The meter’s spectral response only covers the UV region from 245 – 270nm.


To operate your UV meter, aim the sensor window located on the top panel of the meter directly at a UV source. Press and hold push-button switch on the face of the unit. Aim sensor window in the top panel of meter directly at UV source. Note reading on LCD and record if required.

The battery operation voltage is 9V down to 6.5V. Below 6.5V the LCD numbers will begin to dim, indicating the need for a battery replacement. Under “typical” service load, the battery should last about 2 years.

  • Wear eye and skin protection when checking UV lamps (a face shield that provides wrap-around protection is ideal).
  • Allow lamps to warm-up prior to taking readings (at least 5 minutes).

Additional information

  • When comparing different types of lamps consider readings to be relative rather than absolute.
  • Lamps that peak near 255 nm (newer designs) will read higher than lamps that peak near 265 nm.
  • Do not subject the meter to extremes in temperature, humidity, shock or dust.
  • Use a dry, soft cloth to clean the instrument. Keep the sensor free of oil, dirt, etc.


Measurement unit mW/cm2
UV spectral response 246 – 268 nm
Peak response 250 – 260 nm
Measuring range 0 – 19.9 mW/cm2
Display graduation 0.1 mW/cm2
Display 3.5 digit LCD
Weight 128 g
Dimensions 105 mm x 60 mm x 3 mm
Operating temperature range 0 – 37oC
Operating humidity 5 – 80 & RH
Power supply 9 V battery
Sensor GaAsP photodiode
Accuracy + / – 10 % Ref NIST
Calibration interval 6 – 12 months depending on usage