SPECIFICATIONS MODEL 325 Level Range Lo = 32-80 dB Med = 50-100 dB Hi = 80-130 dB Frequency Range 31.5 Hz to 8 kHz Dynamic Range 50 dB Accuracy ± 1.5 dB (ref 94 dB @ 1kHz) Display 4 digit LCD Frequency Weighting A, C Time Weighting Fast, Slow Microphone 1/2" Electret condenser Auxiliary Outputs AC output Power 9V Battery Battery Life 60 hours (with alkaline battery) Operating Condition -23 to 104 °F (0°C to 40 °C) <90%RH Dimensions 9.1 x 2.1 x 1.3" (231 x 53 x 33 mm) Weight approx. 5.78 oz (180 g)