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The FM1/STUZ is used on a number of pool and spa controls and has numerous other industrial applications.
This is a 24 hour timer which may be used for multiple timing configurations. There are 96 individual trippers on the front dial. Each tripper controls a 15 minute section of the day. The on time is controlled by pulling each 15 minute tripper outward from the face.
There are a number of different models. This is the standard 24 hour model with a timer motor requiring 240 volt AC input power.
The model number is shown on the back, 01.76.0021.1