Texas Instruments WR-25 - Manual (Page 7)

Press select a tenth time (the single dot is now located at the top, between the hour and minute);
the peak of the cycle hour (usually high tide) will be displayed. Change as desired.
Press select an eleventh time (the single dot remains at the top between the hour and minute), and
the minutes of the peak hour will be displayed. Change as desired.
Press select a twelfth time and the unit will return to normal display mode.
Calibration mode
index / top
See the calibration reference section on page 18 for other details.
Calibration Method
Press select and scale at the same time, and the unit enters the calibration mode, first displaying
the Aux temperature. (If the Aux dip switch is in the off position, the unit will skip this calibration). If
necessary, press the maximum or minimum key to enter the proper temperature.
WR-25 Instruction Manual
Texas Weather Instruments, Inc. WR-25 Instruction Manual