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Radiometer UV D3 Vitamin - A Hand Held Digital UV D3 Vitamin doser
SOLARMETER® MODEL 6.4 - Vitamine D3
Vitamin D3 IU per Minute. International Units (IU) of natural vitamin D3.

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250,00 €

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Applications of SOLARMETER® 6.4 :

• Vitamin D Dose in IU/min
• Lamp Intensity in Terms of Vitamin D Production
• Solar Intensity in Terms of Vitamin D Production

Features and Benefits of SOLARMETER® 6.4 :

• Hand Held Integral Sensor
• Accurate Calibration
• NIST Traceable
• Compact and Durable
• LCD Readout

Sensor :

Silicon Carbide (SiC) Photodiode packaged in hermetically sealed UV Glass window cap. Interference  filter  blocks  most  non-erythema  (non-D3) irradiance from response as shown on Spectral Sensitivity Graph”.

Meter Operation :

To operate your Solarmeter, aim the sensor window located on the top panel of the meter directly the sun or UV lamp source.

Press and hold the push-button switch on the face of the meter. Reading represents IU/min D3 on 10% body surface.

Battery operation voltage is viable from 9V down to 6.5V. Below 6.5V the numbers on the LCD display will begin to dim indicating the need for battery replacement. Under typical service load a standard 9V battery will last around 2 years.

Proper Usage of Solarmeter® D3 Radiometer :

• Wear eye protection when checking UV lamps (Glasses that provide wrap around protection are ideal).
• Allow lamps to warm-up prior to taking readings (at least 5 minutes).
• Keep track of exactly how long you are exposed to a UV source to properly calculate total vitamin D produced.
• Do not subject the meter to extremes in temperature, humidity, shock or dust.
• Use a dry, soft cloth to clean the instrument. Keep sensor free of oil, dirt, etc.

Please go to and  choose the Solarmeter Model 6.4 page to receive a downloadable interactive Vitamin D calculation utility to aid in your use of the meter.

Some helpful formulas embedded in the utility found at

•  1000 IU = 1 MED (Minimal Erythemal Dose) The minimum dose of radiation that produces a sunburn.
•  1 IU/min = 1/1000 MED/min (or 0.06 MED/hr, which = 1/16.67 MED/hr)
•  1 MED/hr = 2.33 UVI and 1 MED/hr = 16.67 IU/min.
•  The conversion constant for IU/min to UVI is 16.67 / 2.33 = 7.1 UVI.

Specifications :

Irradiation Range : 0-1999 IU/min
Response : 280-400nm Diffey Erythemal Action Spectrum
Resolution : 1 IU/Min
Conversion Rate : 3.0 Readings/Sec
Display : 3.5 Digit LCD
Digit Size : 0.4 inch High
Operation Temperature : 32° F to 90° F
Operation Humidity : 5% to 80% RH
Accuracy : ±10% REF. NIST
Dimensions : 4.2L x 2.4W x 0.9D (in.)
Weight : 4.5 OZ. (Including Battery)
Power Source : 9-Volt DC Battery
Lens : UV Glass with Diffuser

Ordering Information :

Model 6.4 : D3 Radiometer


Solarmeter® is Solar Light Company Inc.'s brand of specialty hand-held light meters. We are the industry leader in the design and manufacture of UV and Visible Light radiometers for measuring lamp irradiance vs aging, as well as other related applications serving the indoor tanning industry, window film tint measurement, outdoor UV Index measurement, UV curing, reptile and sterilization lamp measurement, red/blue light phototherapy, LED measurement, and photovoltaic (PV) solar irradiance metrology. These meters provide long term accurate measurements for both low and high intensity lamp systems, in order to enable output and aging determination. They also measure solar irradiance.

Since 1991, well over 30,000 of these hand-held digital meters have been produced and sold worldwide.

Each Solarmeter® radiometer model comes complete with a carrying case and instruction brochure. Models 4.0 through 9.6 include a NIST-traceable Calibration Certificate, while Model 10.0 includes a WRR-traceable Calibration Certificate.

Generally, lamps need replacement when their output declines 30% (falls below 70% of their new values.) This may occur after anywhere from a few hundred to >1000 hours of use, depending on many various factors. The only way to know for sure is to monitor irradiance with a meter!

The current Solarmeter® models are summarized here:

Model 4.0UVA Meter - 0-199.9 mW/cm²
Model 4.2UVA Meter - 0-1999 µW/cm²
Model 5.0Total UV (A+B) Meter - 0-199.9 mW/cm²
Model 5.7Total UV (A+B) Meter - 0-1999 µW/cm²
Model 6.0UVB Meter - 0-19.99 mW/cm²
Model 6.2UVB Meter - 0-1999 µWcm²
Model 6.4Vitamin D3 Meter - IU per Minute
Model 6.5UV Index Meter - 0.199.9 Irradiation Range
Model 7.0UV Erythemally Effective (Eeff) Meter - 0-199.9 MED/hour
Model 7.5UV Erythemally Effective (Eeff) Meter - 0-19.99 W/m²
Model 8.0UVC Meter - 0-1999 µW/cm²
Model 9.2Bilirubin Light Meter - 0-1999 µW/cm²
Model 9.4Visible Blue Light Meter - 0-199.9 mW/cm²
Model 9.6Visible Red Light Meter - 0-199.9 mW/cm²
Model 10.0Global Solar Power Meter - 0-1999 W/m²

Please be sure to visit all the pages on this site to learn more about each specific model.

Solar Light Company, Inc. is recognized worldwide for over 50 years as America's premier manufacturer of precision ultraviolet light sources, solar simulators, and radiometers. Our standard line of UV, visible, and IR radiometers and light meters measure laboratory, industrial, environmental, and health related light levels with NIST traceable accuracy. Column ozone, aerosol, and water vapor thickness measurements, in addition to long-term global ultraviolet radiation studies all over the world are performed using our atmospheric line of instrumentation. Solar Light also provides NIST traceable spectroradiometric analyses, calibrations for light meters and light sources, OEM instrumentation and monitors, and accelerated ultraviolet radiation degradation testing of materials.

Solarmeter® is a registered trademark of Solar Light Company, Inc.