Sound Level Meter and Calibrator Kit 2 35 to 135 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 4 Digit LCD 500 ms Response Time Microphone Type Electret Condenser Microphone Size 1/2 in Standards ANSI S1.4-1983 CE IEC 61672-1 Class 2 Operating Temp Range 32 Degrees to 104 Degrees F Built-In Fast and Slow Time Weighting Data Hold and Max Hold Functions Low Battery Indicator Auto Shut Off 9V Battery Type