Sound Level Test Instrument Dimensions L x W x H: 265 x 72 x 21 mm Frequency range: 31.5 Hz...8 kHz dB range: 30...135 dB Analogue output: + Batteries: 4 x LR6/AA Interfaces: RS232 Measuring error, dB: ±2 dB Resolution, dB: 0.1 dB Storage capacity: 16000 Measurement values