The Lusterleaf Dial Compost Thermometer helps in gardening and keeping plants healthy. It monitors soil compost temperature so you can keep conditions optimal for plant growth and nutrition. Made of stainless steel, this garden thermometer is durable and sturdy. The 19" probe reaches deep into compost for accurate temperature measurements. It uses a needle and a circular temperature scale that is easy to read, and it has a range of 0 to 220 degrees Fahrenheit.