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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 7 day timer which may be used for multiple timing configurations. There are 84 individual trippers on the front dial. Each tripper controls a 2 hour section of each day of the week. The on time is controlled by pulling each 2 hour tripper outward from the face.
The model number is shown on the back, 01.76.0020.1