Ball watch company trainmster kelvin fahrenheit this ball trainmaster kelvin fahrenheit is showcased on a smooth silver dial which is 395mm in diameter and just 118mm in depth the trainmaster kelvin fahrenheit is also water resistant up to 300 meters a sub dial above 6 o clock shows balls patented mechanical thermometer which measures an outside temperature between minus 31 degree fahrenheit and plus 113 degree fahrenheit a wonderful addition to this sleek and elegant timekeeping instrument