Pocket-sized, the new
‘Sonus’ (Latin for
sound) sound level- and
dose-meters from Castle
Group pack a high level
of specification, into a
small body.

Top of the range is a
combined sound- and
dose-meter sporting
dual-frequency
measurement, data-logging to a
sizeable memory and measurements
to support noise at work and
environmental applications. Features
include dual-frequency measurement,
availability of 3 Ln percentile values,
and crack resistant plastic case.

Data can be downloaded to Castle’s
dBdataPRO software where instant
analysis of hearing protection can be
performed using an in-built database
of ear defenders on the HSE’s HML
assessment method.