Forget wet towel or Bowls with water , its just exhausting . And the effects are only short time solutions
https://www.ink-bird.com/products-humidity-controller-ihc200.html
and the VPD chart
http://www.just4growers.com/media/23631/vpd_2degree.gif
i just started a grow with this controller have a look
growdiaries.com/diaries/41705-club-riot-seeds-white-critical-kush-automatic-grow-journal-by-mrs-larimar-growdiaries
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