Replace aging analog clocks with the multifunction CHRONOS CH93. This multifunction, digital clock features 8 modes: Local Time, UTC/Zulu Time, Flight Timer, Countdown Timer, Stopwatch, Volts, Outside Air Temperature (OAT) and Secondary Air Temperature. The TSO-certified six-digit, seven-segment aircraft clock features external lighting control and a built-in photocell for automatic dimming. An internal, field-replaceable battery maintains Time and Flight Timer memory, without aircraft power.