Two x Waterproof Heat Mats [fermentation temps]
2 x Waterproof heat mats
HYDGOOHO Seedling Heat Mat 2-Pack Heating Mat Hydroponic Heating Pad Waterproof for Seed Germination Cloning and Plant Propagation – affiliate link, note that multiple variations of this product may be available, as such a different version may appear at this link
Also: Yeast Starters and Fermentation | Maintaining Fermentation Temps in Colder Weather
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