Solarmeter 6.2R UVB Radiometer

The Solarmeter 6.2R UVB Radiometer is a handheld, precision instrument designed for reptile keepers who need accurate, repeatable UVB measurements from vivarium lighting. Whether you are monitoring lamp output over time, checking UVB levels at basking positions, or assessing acrylic shield transmission, this meter gives you the data to make informed decisions about your animals' UV exposure.

What It Measures

The 6.2R reads UVB irradiance across the 280–320 nm waveband — the range most relevant to reptile UVB provision and vitamin D3 synthesis. Its measurement range runs from 0 to 1999 µW/cm², with a resolution of 1 µW/cm² and an accuracy of ±10% referenced to NIST standards. Readings update at 3.0 per second, giving a responsive, real-time display on a 3.5-digit LCD with 0.4-inch digits.

Sensor Technology

At the core of the meter is a Silicon Carbide (SiC) photodiode housed in a hermetically sealed UV glass window cap. A metal oxide interference filter coating blocks the majority of UVA from the response, ensuring the meter reads UVB selectively rather than total UV. The diffuser is constructed from virgin Teflon (.003), and the lens is UV glass — both chosen to preserve measurement integrity across the sensor's working life.

Build and Handling

• Compact dimensions: 4.2in L × 2.4in W × 0.9in D
• Lightweight at 4.5 oz including battery
• Powered by a single 9V DC battery, functional down to 6.5V — LCD dimming indicates when replacement is needed
• Battery life approximately 2 years under typical use
• Operating temperature range: 32°F to 90°F; humidity range: 5% to 80% RH
• Simple one-button operation — press, hold, and aim the sensor window at the UV source

Practical Applications for Reptile Keepers

• Monitor UVB output of reptile lamps and track lamp ageing over time
• Check output at basking position to verify animals are receiving adequate UVB
• Test UVB transmission through acrylic vivarium shields or covers
• Calculate percentage UVB when used alongside a Model 5.7 total UV reading (UVA + UVB)
• Compare output between old and new lamps of the same type to determine replacement timing

Correct Use and Lamp Ageing Guidance

Allow lamps to warm up for at least 5 minutes before taking readings, and always measure from a consistent distance and position when tracking ageing. As a general guide, lamps producing 30% less output than their original new reading — dropping to around 70% of that initial value — should be considered for replacement. Always wear UV-blocking eyewear when working with UV lamps directly, and keep the sensor free of oil and dust, cleaning only with a dry, soft cloth.

The Solarmeter 6.2R puts objective, reproducible UVB data in your hands — removing the guesswork from lamp management and giving you confidence that your vivarium lighting is genuinely delivering what your reptiles require.