The Acme 212 is the whistle of choice for HPR handlers working German Shorthaired Pointers, Vizslas, Weimaraners, and similar breeds. It maintains a constant frequency regardless of how hard you blow — critical when you're working dogs at distance and need reliable, repeatable commands in all conditions. Used by field triallers and serious handlers who need consistency under pressure. Pairs perfectly with the Byron Gundogs Lanyard.