Most accurate I have found are digital temperature sensors like the LM92s. Solder a bundle of wires to it (don't forget the decoupling cap!) and encapsulate it in hot glue and heatshrink. Then use foil tape to attach it to the line and cover with foam insulation tape.
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To my surprise, shortly after Naomi Wu gave me a bit of fame for making good use of solar power, Allie Moore got really jealous of her...
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