Acme 535 Silent Dog Whistle - Adjustable Ultrasonic brand_-Sierra It accommodates shotguns with barrels

It accommodates shotguns with barrels up to 32 inches

The exposed lead tip and tapered copper jacket give controlled

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

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

whatever the weather

Acme 535 Silent Dog Whistle - Adjustable Ultrasonic brand_-Sierra It accommodates shotguns with barrelsThe 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