A hand-held, battery powered instrument for the determination and recording of the intensity of radiation emitted or reflected by a target in the field in spectral bands from 400 nm to 12 micrometers. Two fields of view, typically 20.degree. and 1.degree., are provided. The pointing accuracy is 0.1.degree....http://www.google.es/patents/US4495416?utm_source=gb-gplus-sharePatente US4495416 - Remote sensing instrument
