The most versatile handheld depth finder sonar system ever produced | Water depth readings from 1.5 to 300 feet (.5 to approx. 90 M); Automatic depth range adjustment | Water or air temperature readings which are displayed in degrees farhrenheit or celcius on a SoftGlow backlit LCD display | Inductive switching technology (IST) allows the unit to be 100% waterproof up to 200 feet (approx. 61 M) | HawkEye products are manufactured both in the USA and overseas using technology designed and developed with American ingenuity.