S635UV is a small size, compact device which measures and records temperature, relative humidity, illumination and ultraviolet rays simultaneously. The LCD it equipped can display illumination/UV intensity, It adopt USB interface and is able to be access by handheld data management device for data download and analysis. Feature Pocket size, Simple Operation and reliable performance. Touch keys with large screen liquid crystal display. Monitor irradiance, UV intensity, temperature and relative humidity Simultaneously. One button switch,sample interval setting to record and storage of data automaticlly. AC, DC dual-use, both to get the field at any time to measure the acquisition of data, but also for a long time to place the record. Memory for 43000 readings. Connect Logging Data to PC Through USB.