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To start the interval measurement, press the SSS button with the interval displayed in the lower display. Pressing the SSS button with the interval displayed does not affect start/stop of the measurement in the wristwatch. However, the elapsed time measurement in the wristwatch will start just as the interval starts, when the auto-mode is off ( lights off) and measurement is stopped. 4. When the interval counts down to zero, it will automatically change to recovery timer, which counts up until n