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The comparator adopts LM393 chip, which works stably. When the humidity is lower than the set value, DO outputs high level; when higher than the set value, DO outputs low level. Due to the different monitor and light effect, the actual color of the item might be slightly different from the color showed on the pictures.
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.