UV Transmittance monitors quickly and accurately test the UV percent transmittance (UVT) of any water sample. The UV percent transmittance is measured by the UV lights ability to penetrate through a water sample. The less amount of UV light that is able to transmit through the water the lower the percent transmittance, and vice versa.The effectiveness of a UV disinfection system is dependent on the UV dose that the UV disinfection system is able to deliver to the water. The UV dose can be determined primarily from the combined effects of the UV light intensity, the exposure time of the system and the UVT of the water. We have portable, handheld, online, inline process and open channel options available. We supply options from Realtech and from Berson UV.