Onset's data loggers are designed for fast, easy deployment in the field. Choose from low-cost, stand-alone USB loggers with internal sensors; multi-channel loggers with external sensors for monitoring multiple parameters; or a fully-loaded, customized weather station that can be accessed remotely. Our research-grade weather and field data loggers can measure air temperature, relative humidity (RH), rainfall, soil moisture, barometric pressure, solar radiation, photosynthetically active radiation (PAR), wind direction, wind speed and more.