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Interval Adjustable timer (Reminder)

  1. Up, down, and start/stop. Adjust by day, hour, or minute - TR810D, TR810H or TR810M.
  2. Adjust by day, hour, and start/stop - TR810DH
  3. Adjust by hour, minute, and start/stop - TR810HM
  4. Adjust by minute, second, and start/stop, TR810MS
When the countdown reaches zero, an optional function is to start counting up from "0" instead of staying at "0". This can remind you how long it has been passed.