Urban Worm Thermometer - Perfect for the Garden & Worm BinKeep track of soil and worm bin temperature accurately with the Urban Worm Thermometer. The stainless steel stem penetrates up to 5 inches into soil to give you the most accurate reading. And the green, yellow, and red tick marks let you know when you're in the optimal zone for your soil microbes and worms. Also available with 2 bricks of Urban Worm Coco Coir and 2 Urban Worm Blankets as part of the Worm Bin Accessory Bundle.