From the manual, such as it is:
Set the Time Manually:
If you want to set your alarm clock a little ahead or if the unit ever loses time for any reason, the time can be set manually by following these steps.
1) Press and hold the "CH./SET" button for seven seconds to begin the manual time set mode. (2 BEEPS) The hour will flash on and off.
2) Adjust each setting by pressing the "+" or "-" buttons. Confirm and move on to the next setting by pressing the "CH./SET" button.
MANUAL TIME ADJUST SEQUENCE: hour, minute, year, month, date
This works for me. You have to be sure to keep pressing the CH/SET button for the full seven seconds -- the first beep the the clock gives you will only allow you to set the time zone and DST function.
SOURCE: I have an Acurite 822-RX thermometer that shows HH
HH means it is showing the high temperature you (most likely accidentally) set with the MAX MIN / + button, which is easy to do when setting the clock. Just press that button again until the reading appears.
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