Buy the probe kit I have 3 of them all different sizes I got 1 from pets smart and 1 from eBay and the nicest one that's good plated for 45 at a reptile show but it's my favorite one not because it's gold plated but because their the perfect sizes in that kit for all age and size ball pythons and they have the round ball at the end of the steel rod so it males it way safer for the snake

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