Lighthouse Thermometer. Lighthouse Wood Window Thermometer - This wood thermometer is produced from fast growth Albesia wood (a renewable resource) and they are are hand-carved. They are hand-painted on both sides. They are mercury free, and the paints and finishes are lead-free and non-toxic. It has a weather resistant polyurethane finish. Measures approx 4.9" x 0.8" x 5.9". The thermometers read in both Fahrenheit & Celsius. Suction cups are included.