What is the max weight it can handle? (baby size)
The weight is for Newborn 0-36 Months…so that bathtub could hold up to 49kg (108 lb)
How much water does it hold?
It will probably hold the water for two large washbasins, 25L.
How do I turn off the thermometer when not in use?
You just take the temp gage out of the water.