Acme 535 Silent Dog Whistle - Adjustable Ultrasonic brand_-Sierra whatever the weather

whatever the weather

the Burma Pro MFS rewards proper care with years of reliable service

while the boat-tail base steadies the bullet through its flight

marking their silver wedding with a hunt in the wild country of Zimbabwe

for handloaders building their own

Acme 535 Silent Dog Whistle - Adjustable Ultrasonic brand_-Sierra whatever the weatherThe Acme 535 is the original ultrasonic gundog training whistle, made in Birmingham by J. Hudson & Co, the firm that invented the silent dog whistle. A screw piston mechanism lets you adjust it across a single variable frequency between 5,200 and 12,800Hz, so you can tune the pitch to suit your own dog and lock in a consistent recall note. To the dog the sound is loud and clear, carrying up to 1. 5km, yet it sits largely above human hearing, which is