Review on RCYAGO Radiation Illuminance Luminosity Measurement by Scoony Taker

Bought because I needed something other than a several hundred dollar lab instrument to test counterfeit UV lamps. As others have pointed out, this is a push button on/off switch, not a momentary button like some reviews have claimed, and it works pretty much as you would expect. I don't have a lab quality UVC meter to compare to some reviewers, but as a backup I held it in direct sunlight with a UV index of 8 (UVA + UVB from a calibrated sensor) and got a reading of zero, so actually it measures UV-C, not just light in general or all UV wavelengths.