Acme 535 Silent Dog Whistle - Adjustable Ultrasonic brand_-Sierra it is equally at home

it is equally at home in a game larder or utility room for anyone who prepares their own birds

It accommodates shotguns with barrels up to 32 inches

A sensible addition for anyone running a larger Swarovski scope from a tripod in the field

hunting and fishing — where freedom of movement matters as much as practicality

Acme 535 Silent Dog Whistle - Adjustable Ultrasonic brand_-Sierra it is equally at homeThe 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