Sound Level Meter Class 2 Datalogging 30 to 130 dB dB Range Frequency Range 31.5 Hz to 8 kHz A and C Frequency Weighting Accuracy +/-1.4 dB Resolution 0.1 dB Display Backlit LCD 2 000 Counts Fast 200 ms Slow 500 ms Response Time RS-232 SD Card Interface Microphone Type Electret Condenser Microphone Size 1/2 in Standards IEC 61672-1 Class 2 Records Up To 20 000 Readings Operating Temp Range 32 Degrees to 104 Degrees F Output Jack AC Analog RS-232 (6) AA Battery Type