Three of CNR 1 features are unique: first, it measures four radiation components separately,
secondly, it is robust and virtually maintenance free, and thirdly, calibration of CNR 1 is relatively
straightforward. These factors make the CNR 1 extremely suitable for long-term outdoor
measurements. Especially in rough environments. Generally speaking, the CNR 1 will measure with
a higher degree of accuracy than other competitive instruments. This is mainly because the
dominant measurement of solar radiation with the CM 3 is accurate. Accuracy is also influenced
positively by the possibility of viewing the four separate components of the radiation. In this way
errors in the measurement can be detected more easily. Also contributing to a high degree of
accuracy, is the CNR 1's high reliability, and, under conditions where other instruments would be
covered by dew or frost, its incorporated heating.