Calculated Industries 7435 is an easy-to-use tool for measuring moisture in firewood and lumber. Use it to check if firewood is ready to burn by measuring its moisture content. The meter displays the moisture content as a percentage, and it has three ranges: Ideal (6-15%), Good (16-20%), and Too wet (21-44%). You can also use the 7435 to make sure you're getting dry, ready-to-use lumber at the lumber yard. Woodworkers can save money on expensive pieces of wood for their projects by making sure they are using good, dry wood. The 7435 is accurate to within 2%, and it has a one-year warranty.