Acme 210 dog training whistle
ACME Whistle 210 Recommended for close work
Easy to blow .and fitted with a pea / pearl which is waterproof.
Has a High pitch / tone
The 210 Acme gives a trill for those who want a distinctive and different sound.
Also used as a STOP whistle.
The ACME 210 has a frequency that fluctuates by 750 Hertz.
The number is marked on the whistle.