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Onset data loggers and weather stations are used to measure a broad range of parameters. This includes indoor environmental measurements such as temperature, relative humidity, and CO2; energy/power measurements such as kilowatt hours, voltage and current; time-of-use measurements such as motor on/off, light on/off, and events; water measurements such as water temperature, water level, and dissolved oxygen, and weather/field measurements such as temperature, rainfall, wind speed and direction, and barometric pressure.