I don't agree with John that all these products are almost useless. For most keepers a product like plexiglass alltop is used instead of normal glass. So although 30% of uvb is lost, 70% is retained compared to zero through normal glass. I wouldn't call that almost useless but rather useful!
Alltop is the established product and has about 66% uvb transmission at new. Yes it does decline a bit but not to the extent John suggests.
In relation to uvb meters as far as I know nothng short of the solarmeter 6.2 from solartech is worth bothering with.
There is definately scope for new materials and products but the UK market is small. The sector is more deveoped in Germany where there are various reptile enclsoures on the market made from uv transmitting materials.
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Testudo Hermanni Hermanni (Corse) tortoises
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