We got the Avent thermometer - it's a room & bath in one and has the correct temp on the display - for bath water says it should be 37 which I find nice and warm (I have very hot showers though) and my lo seems happy in and she's definitely not pink when she comes out so not too hot for her.
I tend to have it a little warmer, but we use the big bath and I hop in with him, I just make sure it's not too hot that I have to do the "ouch ouch ouch" dance when I get in...but still warm enough that it doesn't go cold too quick, cause Dylan loves it and stays in there for over 20 mins.
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