The name of those waterballoon toys you use to reg temp in a 'bator?

Chicken Keith

12 Years
Jun 1, 2007
Huntsville, Alabama (Go Vols)
Hello all, I last hatched eggs in 2007. Been a little busy since (I'm a beekeeper too). At that time I remember using this waterballoon toy shaped like a fat doughnut. It was a cheap toy for children, but it was useful to put the bulb of a thermometer into to get an accurate reading on a liquid filled casing, like an egg.

Do you have any idea what this toy is called?

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