Wireless Indoor / Outdoor Thermometer
with Self-Setting Atomic Clock
Thank you for selecting the Oregon Scientiﬁc Wireless
Indoor / Outdoor Thermometer with Self-Setting Atomic
Clock (RMR682A). The main unit can support up to 3
sensors. To purchase additional sensors, please contact
your local retailer.
NOTE Please keep this manual handy as you use your new
product. It contains practical step-by-step instructions, as
well as technical speciﬁcations and warnings you should
1. Channel number and sensor reception status
2. Sensor low battery warning
3. Maximum / minimum outdoor temperature reading
4. Indoor temperature display icon
5. Main unit low battery warning
6. Maximum / minimum indoor temperature reading
7. Alarm is set
8. 12-hour clock
9. Alarm is displayed
10. Radio-controlled clock reception icon
11. Hi / lo alarm is displayed
12. Outdoor temperature trend icon
13. Ice warning is active
14. Outdoor temperature reading
15. Indoor temperature trend icon
16. Indoor temperature reading
17. US time zones
18. Time, alarm and date
1. MEM: View current, maximum and minimum
2. TEMP HI / LO : Change settings or enable /
disable hi or lo temperature alarm for channel 1
3. / : Increase / decrease setting; activate /
deactivate clock reception signal
4. CHANNEL: Switch remote sensor display
5. MODE: Change settings / display
6. ALARM: View alarm status; set alarm
7. Battery compartment
8. ZONE: Toggle between the 4 US time zones
9. °C / °F: Select temperature unit °C / °F
10. RESET: Reset unit to default settings
REMOTE SENSOR (THN122N)
1. LED status
indicator: Blinks red
2. Ventilation duct
Insert batteries before ﬁrst use, matching the polarity (+
NOTE Install batteries in the remote sensor before the
main unit. Press RESET after each battery change. Do
not use rechargeable batteries. We recommend that you
use alkaline batteries with this product for longer usage
and lithium batteries in temperatures below freezing.
shows when batteries are low.
Main Indoor temperature area
Remote Outdoor temperature area
The sensor collects temperature readings approx. every
40 seconds and sends them to the main unit. The main
unit can collect data from up to 3 sensors.
To set up the sensor:
1. Remove the screws from the battery door.
2. Insert the batteries, matching the polarity (+ / -).
3. Select a channel. Make sure you use a different
channel for each sensor.
4. Place the sensor near the main unit. Press RESET
on the sensor.
5. Simultaneously press CHANNEL and MEM on the
main unit to initiate signal sending between the
sensor and main unit.
6. Close the battery door and secure the screws.
7. Place the sensor in the desired location using the
table stand or wall mount.
For best results:
• Place the sensor out of direct sunlight and moisture.
• Do not place the sensor more than 30 meters
(100 feet) from the main (indoor) unit.
• Position the sensor so that it faces the main (indoor)
unit, minimizing obstructions such as doors,
walls, and furniture.
• Place the sensor in a location with a clear view to
the sky, away from metallic or electronic objects.
• Position the sensor close to the main unit during
cold winter months as below-freezing temperatures
may affect battery performance and signal
The transmission range may vary depending on many
factors. You may need to experiment with various locations
to get the best results.
Standard Alkaline batteries contain signiﬁcant amounts of
water. Because of this they will freeze in low temperatures
of approximately -12°C (10°F). Disposable Lithium batteries
have a much lower threshold for temperature with an
estimated freezing range of below -40°C (-40°F).
Wireless ranges can be impacted by a variety of factors
such as extremely cold temperatures. Extreme cold may
temporarily reduce the effective range between the sensor
and the base station. If the unit’s performance fails due to
low temperature, the unit will resume proper functioning
as the temperature rises to within the normal temperature
range (i.e. no permanent damage will occur to the unit due
to low temperatures).
SENSOR DATA TRANSMISSION
Data is sent from the sensor(s) every 40 seconds. The
reception icon in the outdoor temperature area shows the
Main unit is searching for the
A channel has been found
Sensor 1 is sending data
The sensor cannot be found.
Search for the sensor or check
To search for a sensor:
Simultaneously, press and hold
MEM and CHANNEL for
NOTE If the sensor is still not found, check the batteries,
obstructions, and remote unit location.
This product is designed to synchronize its date and time
automatically once it is within range of the WWVB-60
signal from the atomic clock in Boulder, Colorado.
The sensor collects the radio signals whenever it is within
1500 km (932 miles) of a signal.
NOTE Initial reception takes 2-10 minutes for ﬁrst set up or
when RESET is pressed. Once complete, the reception icon
will stop blinking. If the signal is weak, it can take up to 24
hours to get a valid signal.
STRONG WEAK NO SIGNAL
To enable and force a signal search:
Press and hold for 2 seconds.
To disable the signal reception:
Press and hold for 2 seconds.
ﬂashes when it is enabled.
To manually set the clock make sure the clock signal
reception is disabled.
To manually set the clock:
1. Press and hold
MODE for 2 seconds.
2. Press and to change the settings.
MODE to conﬁrm.