T-964 U.V. Meter with temperature This meter gives UV transmission percentages, UV power, and temperature. The GT964 is the most versatile product available for measuring UV. You can measure UV intensities (irradiance), UV Transmission %, and temperature in Fahrenheit and Celsius. Unlike other UV products on the market, the GT964 is extremely simple to operate. The digital display is continually updated with real-time readings. The T964 is powered by a 9-volt alkaline battery (included).