I am going to get a rack for christmas and I'm thinking of building one too but every plan for rack building is talking about putting your probe on the flexwat but I really don't want to buy a accurite for every tub. Is it ok to get a tempgun and would you want to read the temperature of the flexwatt or the inside of the tub? Also what should your helix be set at? I don't have mine yet but I want to know at what temp it should be set. My parents keep our house at like 72 most. In the winter and about 80 in the summer