4 inch dial with large easy-to-read numerals. Swivel arm mounting bracket with matching hardware. Adjustable for just the right viewing angle. Exclusive FR4 precision coil movement measures both Fahrenheit & Celsius more accurately across a greater range of temperatures. Hygrometer movement measures humidity. Solid brass & glass construction. Crystal won’t yellow or craze. Living Finish Brass won’t peel, flake or rust; patinas with age. Lifetime warranty.