La Crosse Technology WS-9121 - Manual (Page 18)

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SET/CH key (Setting/Channel)
• Press and hold for about 3 seconds to enter the Manual setting
mode.
• Press shortly to toggle between different channel readings.
MIN/MAX/+ key (Min/ Max temperature)
• Use to toggle between the minimum and maximum recorded
readings of indoor & outdoor temperature.
• Press and hold to reset minimum and maximum record (when min
or max record is shown).