Ecocycle Backyard Compost Thermometer - 20" Stainless Steel (6mm) Stem - FREE Composting E-Book - Color-Coded Temperature Zones - 40-180&deg;F Range - Monitor Interior Temperatures of Your Compost Bin LONG STEM  20" long stainless steel stem for accurate readings, great for larger backyard compost piles. Temperature is read from the tip, and takes about 30 seconds. EASY-TO-READ DIAL  2" dial with color-coded temperature zones with 40 - 180F range and in 2 increments for accurate readings. WATERPROOF ANTI-FOG LENS  Hermetically sealed to avoid fogging and moisture. Can be left in the compost pile overnight. DURABLE AND LONG-LASTING  Ecocycle offers a thicker 6mm stem than other competitors for long-term durability. Rigid stem won't bend or break! FREE COMPOSTING E-BOOK  Beautifully designed e-book helps beginners learn lots of tips on how to create and maintain a compost pile.