The Faithfull Sound Level Meter is a compact digital tool for recording noise levels. It can be used to measure the sound level in all kinds of environments, such as factories, schools, offices, traffic, roads etc. Features include over-range indication, Max./Min. measurement mode, data hold, low battery indication, auto power-off and more. Sound level meters are instruments designed to react to the noise much like the human ear. The measurements taken by sound level meters are compared to known standards to identify whether the noise level could have a detrimental effect on humans located near the noise source. It is supplied with a removable wind noise reducing cap, batteries and user manual. Display: 4 digits LCD with backlight Frequency Weighting: A Measuring Range: 30 dB - 130 dB Frequency Range: 30Hz~8kHz Resolution: 0.1 dB Accuracy: ±1.5 dB Over-range Indicator: "OL" appears when the measured value is higher than the upper limit of the measuring range. "LO" appears when the measured value is lower than the lower limit of the measuring range. MAX./MIN. Measurement Mode Time Weighting: FAST mode and SLOW mode Microphone: Omni-directional Condenser Microphone Operating Altitude: