The RTR-500/RTR500B series allows you to mix and match an array of wireless radio communication loggers with various Base Units or Data Collectors to meet your needs. Logged data can be automatically sent via network or mobile communication to be saved in cloud storage or to a specified location. The RTR-574-S measures and records 4 items: UV, illuminance, and temperature and humidity with superior accuracy. It also records and displays cumulative UV and illuminance.