The CNR4 is a research-grade net radiometer that measures the energy balance between incoming and outgoing radiation.
It has a pyranometer and a pyrgeometer that face up and another pair that face down. Both a thermistor and an RTD are built in for temperature compensating. The solar shield on the CNR4 reduces thermal effects on the sensors and the bubble dome sheds water and increases the field of view.
Claimed to feature high accuracy, it is compatible with CR1000, CR3000 and CR5000 data loggers and has an optional ventilation unit with heater.