Sometimes it's hard to determine whether wood is too wet to burn, which can result in an abundance of smoke and soot - not a healthy or clean situation. Testing wood for its moisture content is easy with a moisture meter. When stuck into the wood, the four sensitive prongs accurately test the moisture content and give you a reading on a clear LCD screen. These convenient devices come with a carrying case, 9v battery and instructions. Wood with the proper moisture content of 15 to 20% will burn the best.