I use Xikar products - they are the industry leader in cigar humidor monitoring and people spend thousands on cigars so it's good enough for my snakes. Not to mention Herpstat uses them to calibrate their equipment and I use Herpstat as well.
https://www.xikar.com/products/humid...-hygro-system/
https://www.xikar.com/products/humid...l-hygrometers/
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