A device for measuring radiation is disclosed. The device comprises optics and electronics at least partially enclosed in a housing portable by a single human being. In a preferred embodiment, the housing comprises a window to admit radiation of a desired wave length and houses optics and electronics to collect and convert admitted radiation into an electrical signal. A data processor may be disposed in the housing or exterior to the housing and may convert and store the electrical signal into an analyzed, e.g. digital, form. It is emphasized that this abstract is provided to comply with the rules requiring an abstract which will allow a searcher or other reader to quickly ascertain the subject matter of the technical disclosure. It is submitted with the understanding that it will not be used to interpret or limit the scope or meaning of the claims.