Solarmeter is the one I see most which when it comes to UV bulbs for growers isnt much. Agromax has one in a vid they show on you tube but its kind of quick and doesnt show any other info like distance measured etc. Do any members here actually have one ? They are kind of pricey but I see on youtube there seems to be one thats actually comparable for about half the price. Granted its UVB only but still thats more important part of the UV spectrum for growers. Im seriously considering buying one. Maybe. Possibly.