lifeguard whistles are the same, but not
If you get lifeguard whistles that are Fox 40 brand, they are functionally equivalent. They usually are a buck or two cheaper. But, the black ones usually have a white medical cross on the side, so I never used them for my high school games.
I did however, buy a couple of dozen of them for my teenage age referees for the twelve year old league. I added a little black marker and no one knew the difference.
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