AQUATOPIA Floating Safety Bath Thermometer for Infants, Digital Audible Alarm, Beeps when too hot or too cold! (Green) Price: $19.97 (as of 06/03/2021 22:30 PST- Details)

Easy to use Alerts you with an audible alarm if the water is too hot (100.4~F/38~C) and if too cold below (89.6~F/32~C)
Automatically activates in water
Reads bath temperature every 2 seconds