Some things to consider about whistles, and why absolute "loudness" is not the only, or best, criterium.
ISO 12402-8:2006(en)
Personal flotation devices — Part 8: Accessories — Safety...
Type: Posts; User: Gingham
Some things to consider about whistles, and why absolute "loudness" is not the only, or best, criterium.
ISO 12402-8:2006(en)
Personal flotation devices — Part 8: Accessories — Safety...