Sound Level Min. dB = 30 / Sound Level Max. dB = 130 / Sound Level Resolution dB = 0.1 / Sound Level Accuracy dB = 1.4 / Accuracy Class = Class 2 / Response Time (Fast) ms = 125 / Response Time (Slow) s = 1 / Interface Type = USB / Interface Type = RS232 / Display Type = LCD / Battery Type = 4x AA / Frequency Measuring Range Max. kHz = 8 / Frequency Measuring Range Min. Hz = 20 / Built-in Calibrator = No