A digital meter that reads the UV Index, with its sensor response weighted to the vitamin D3 action spectrum — which is to say it measures ultraviolet the way a reptile's skin uses it, rather than raw energy. That weighting is what lets you set a basking-zone UVI to match a species' Ferguson zone and compare one lamp type directly against another. A quick-reference scale is printed on the meter itself.
What it does
- Reads UV Index — biologically weighted to vitamin D3 synthesis.
- Comparable across lamp types — unlike a µW/cm² radiometer.
- Species reference scale printed on the meter.
- Set the basking zone properly — measure where the animal sits, not where the lamp is.
Who needs one
This is a serious instrument at a serious price, and it makes sense for breeders, multi-enclosure collections, and anyone keeping a species with narrow UV requirements. For a single enclosure, replacing lamps on schedule is a reasonable substitute. If all you want is to know when a lamp has faded, the cheaper UVB Meter radiometer does that job.
Lamps in Reptile Heating & Lighting.
