Well the UDH is very small. It's 10x12.5cm or 4'x5' and it's also not in direct contact with the tub's bottom, the tub is lifted up a bit, about 2cm so it's really just a small part that really is at 30°C, measuring temp around 5cm from the hotspot starts to drop and around half of the tub towards the cool end it's already the cool temp.
This is what I use to read temp
https://www.amazon.com/gp/aw/d/B0053...RXL&ref=plSrch
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