Abstract— Seven Robertson-Berger ultraviolet meters located at National Weather Service stations were subjected to a laboratory analysis of their spectral response functions. The analysis revealed that all spectral response functions were similar in shape in the important erythematogenic wavelength region of 300–330 nm; however, a few of the spectral response function wavelength positions varied slightly. The average of the spectral response functions was compared to Robertson-Berger meter spectral response functions published in the 1970s. and they agreed within experimental error. This finding suggests that the shapes of the spectral response functions did not change or changed only slightly during the meters' long-term exposure in the network. To provide insight into the problems associated with measurement of ultraviolet radiation in the UV-B region (295–320 nm), examples of errors caused by wavelength band shifts and calibration procedures are given.