A A 1.3" face design allows easy reading of these super accurate gauges. Water resistant to 3 ATM, the weatherproof anodized alloy case withstands shock and abuse and the non-oil filled thermometer uses German bi-metal technology to accurately display temperature readings from -20 to 140 degrees Fahrenheit. The rugged clock will provide up to 4 years of time keeping with the included, easily replicable button cell battery. Comes ready to install anywhere as a stick-on mount, or use with a Snap-Back Bolt-On Kit (#3649) to attach as a standard ¼" post-type bracket. Choose silver body with white face or black face and body. 1.7" case.