I use this whistle to recall and to give feedback to my ACD. It is durably made, has a pitch adjustment and a lock screw that doesn't accidently change settings. It came with simple instructions and that aided me in understanding how to properly use this tool. I learned how to use it then taught my Girl to respond to it and now we are both happier/safer because of it. It is made in the UK and is made with quality metals and has a superior finish; I expect it to last me a lifetime.
Get more detail about Acme Silent Whistle.
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