Sound Level Meters are handheld devices, which can be used for workplace noise or environmental surveys.
Models are available to measure just the cumulative noise (CEL-620) such as average and peak levels for workplace noise,
where octave band (B versions) can be used for the selection of hearing protection.
The CEL-630 series features
time history storage and parameters for environmental noise (CEL-633) and also have 1/3 octave band analysis (C versions).