Acumen Hydra-Alert HRM EON-2027HS Instruction Manual page 60

If you do not have a calibrated MET value or put on a HR transmitter, the watch
will only use your pre-set MET value or our default value (Aerobic with Medium
Intensity). Please make sure to re-select your exercise type and intensity every
time with the procedure mentioned above.
However, if you have already calibrated your own MET value and put on a
HR transmitter, the displays of Fluid Loss Setting (Exercise Type and Intensity)
will automatically be turned off as the watch will calculate the best MET value
for you.
2. When a Lap is finished and the stopwatch is stopped:
- Press MODE/NXT Button
mentioned before, plus the Select TZ Mode and Interval Timer Mode..
You can re-select Target Zone or re-set Interval Timer before start a new
lap (if you did that, when you re-start the stopwatch, it begins with a new
lap).
The Interval Timers are used for timing your exercise under a selected
Target Zone. If you turned on the Interval Timer, you could not re-select the
Target Zone and the Select TZ Mode would not show. The Select TZ Mode
is displayed until the Interval Timers are finished or turned off.
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repeatedly to circle around all modes
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