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The top rated SMSCOM Nutrimatic Drip Irrigation Timer is a part pre-programmed pump timer that is perfect for use in drip irrigation systems. It is the first precision seconds timer that adjusts the frequency of the irrigation cycles to match the plants requirements. You set the number of seconds you want each dose to last, and the timer takes care of the frequency of the doses so you don't need to worry about when or how often you should be feeding.
Or for those on a budget, a Grasslin Segmental Timer can suit most purposes quite nicely!