Know of any different Humidity gauges that fits in jars?

5g buckets. And an auto-burp system.
Nagel420’s Auto-Burp System - Overgrow.com

That can be scaled up and down as needed. A single mason jar, or 50 x 5g buckets. Size the air pump accordingly. I was inspired by a muti-bucket commercial system I saw, and came up with the mason jar size version.

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