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I compared this with two others on Thingiverse. This one was second of the line-up. It's so loud and has a great pitch. I particularly love the warble effect from the double, it's very much a sports whistle tone. There's not a lot of resistance so it takes much less puff than say the V29 to get the same output. I love the design. It was pipped to the post by the compact emergency whistle, which is so loud and high pitched and needs less puff still to get going.

Tested:

  1. Extremely loud and compact emergency whistle: https://www.thingiverse.com/thing:2933021
  2. Emergency & Sports Whistle: https://www.thingiverse.com/thing:3130078
  3. V29: https://www.thingiverse.com/thing:1179160 (takes a lot of puff)
Extremely loud and compact emergency whistle
Emergency & Sports Whistle
V29
by jzisa