The SLM700 is a stable, safe and reliable sound level meter, designed for all kinds of sound level measurements and compliant to all international standards for sound level meters. It can be switched between two different weighting frequency filters (A and C type) and has a fast (peak value, 125 msec) and slow (average value, 1sec) operation mode. Other functions like a hold button and a Minimum/Maximum mode are also present. The total measurement range is adjustable in four steps of 30dB ~ 80 dB, 50 dB ~ 100 dB, 60 dB ~ 110 dB and 80 dB ~ 130 dB, and can be set manually or by auto ranging. Two 3.5mm AC and DC output jacks, a calibration potentiometer and a 6V DC power connector are present. Supplied with: Microphone windshield, carrying case, 4 x 1.5V (AA) Battery and instruction manual