Dwyer Instruments” Model SM-100 Digital Sound Meter is a good fit for measuring noise levels from 30 to 130 dB with accuracy of +/-1.5 dB. The device has a frequency of 31.5 Hz to eight kHz, three different dB ranges, and a 1/2˝ condenser microphone. The device has two frequency weightings: the “A” weighting ranges from 30 to 130 dB, while the “C” weighting ranges from 35 to 130 dB. The four-digit LCD backlit display has the ability to update in 0.5 seconds when the unit is set to fast response. The device features data hold, ability to record maximum/minimum, auto ranging, auto power-off, and a dynamic range of 50 dB. The compact size of the device makes it easy to operate and store. Each unit includes 9V battery, carrying case, black foam cover to protect the sensor, and instruction manual. The SM-100 is a good fit for technicians measuring and recording sound levels in zones or rooms of buildings, musical halls, theaters, and near equipment or machinery on the plant floor.