Pool thermometers can be used in bathtubs to monitor water temperature for heat exposure protocols. They are an affordable way to ensure the water is at the correct temperature.
go and get one of those pool thermometers right I mean they're like you said they're like anywhere between 5 to 15 float the little floaty ones you put that in your bathtub and you get it up to 104
""The speaker recommends using a pool thermometer to monitor bath water temperature for heat exposure, suggesting that listeners might want to purchase one for this purpose."