La Crosse Technology WS-9121 - Manual (Page 22)

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MANUAL SETTING:
12 / 24- HOUR TIME DISPLAY SETTING AND TEMPERATURE UNIT
(
°C/°F) SETTING
User may choose to display the time in 12-hour or 24-hour mode:
Note:
When the time display is set as 12-hour mode, the temperature unit will
be set to
°F; when the time mode is in 24-hour format, the temperature
unit will be set to °C.