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Benämning

Art.no:  XX-XXXX  Model:  XXXXX

Please read the entire instruction manual before use and save for future reference.  
We apologise for any text or photo errors and any changes of technical data. If you have any 
questions concerning technical problems please contact our Customer Service Department.

GREAT BRITAIN:

 For consumer contact, please visit  www.clasohlson.co.uk and click on customer service.

Internet:

 www.clasohlson.co.uk

GREAT BRITAIN:

 For consumer contact, please visit  www.clasohlson.co.uk and click on customer service.

Internet:

 www.clasohlson.co.uk

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201108

Wireless thermometer w/hygrometer

Art.no  36-4742 

Model 91904 (K0391)

Please read the entire instruction manual before using and save it for future use. 
We apologise for any text or photo errors and any changes of technical data. If you have any 
questions concerning technical problems please contact our Customer Service Department.

Safety

•  Do not expose the device to extreme temperatures or damp. 
•  Avoid contact with corrosive materials. 
•  Never expose the device to dust.
•  Do not dismantle the device. 

Product description

Wireless sensor. Clear display showing indoor and outdoor temperature, humidity, time 
and date. The sensor can be placed up to 30 m (line-of-sight) away from the receiver. 
Supports up to three sensors simultaneously.

Buttons and functions

Operation

Setting the year, time and date 

1.  Press and hold [ SET.ALM ] for 2 seconds, and then use [ 

 ] or [ 

 ] to set the year. 

2.  Press [ SET.ALM ] again, the month digits start to flash. Use [ 

 ] or [ 

 ] to set 

the months. 

3.  Press [ SET.ALM ] again, the date digits start to flash. Use [ 

 ] or [ 

 ] to set the date. 

4.  Press [ SET.ALM ] again, “24 Hr” and “12 Hr” start to flash. Use [ 

 ] or [ 

 ] to set 

the time format. 

5.  Press [ SET.ALM ] again, “0:00” appears and the hour digits start to flash. Use [ 

 ] or [ 

 ] 

to set the hours. 

6.  Press [ SET.ALM ] again, “0:00” appears and the minute digits start to flash. Use [ 

 ] or [ 

 ] 

to set the minutes. 

7.  Press [ SET.ALM ] to return to normal mode. 

Setting the alarm

1.  Press [ SET.ALM ], “AM 7:00 AL” appears on the display. 
2.  Press and hold [ SET.ALM ] for 2 seconds, the hour digits will start to flash. 

Use [ 

 ] or [ 

 ] to set the hours. 

3.  Press [ SET.ALM ] again, the minute digits start to flash. Use [ 

 ] or [ 

 ] to set 

the minutes.

4.  Press [ SET.ALM ] to return to normal mode. 

Turning the alarm on/off

1.  Press [ SET.ALM ] to display the alarm time. When the alarm time is displayed, press [ 

 ] 

once to turn the daily alarm off. 

2.  When the alarm function is turned on, the   icon shows on the display.
3.  When the time reaches the set alarm time, the clock will beep to wake you. The   icon 

will flash. 

4.  To stop the alarm, press [ 

 ].The alarm will stop and the   icon stops flashing. 

Selecting the 12/24 hour display format 

1.  Press [ 12/24 ] to select the display format. 

Selecting Celsius or Fahrenheit

1.  Press [ °C/°F ] to switch between displaying temperature in degrees Celsius or Fahrenheit. 

Reading the highest and lowest recorded temperature 

and humidity readings 

1.  Press [ MAX/MIN ] to view the highest and lowest indoor/outdoor temperature and 

humidity readings respectively. 

2.  Press and hold [ MAX/MIN ] to clear the recorded value and start recording new data. 

Synchronising with multiple outdoor sensors

This unit comes with one sensor. A second and a third sensor can be purchased and used 
with the thermometer simultaneously. 

1.  Set the number of the channel on the extra sensor to 2 (under the battery cover). 
2.  Press [ CHANNEL ]. “CH2” and “_ _” appear on the lower half of the display.
3.  Press and hold [ ALM ON/OFF ] for about 2 seconds. 
4.  Sensor 2 is now synchronised with the thermometer and the temperature 

of the second sensor will appear on the display. 

5.  The same procedure can be repeated for a third sensor. 

Care and maintenance

Clean the product by wiping it with a soft, dry cloth.
Never use solvents or abrasive cleaning agents. 

Troubleshooting guide 

Problem

Solution

Wrong outdoor temperature 
displayed on the receiver.

Wait 1–2 minutes to make sure that the sensor and 
receiver are in sync. If not, resynchronise them. 

The temperature on the sensor 
seems to be too high.

Make sure that the transmitter is not placed in direct 
sunlight or next to a heat source.

The receiver cannot receive 
signals and display them.

•  Synchronise the units again.
•  The temperature could be under -50 °C.
•  The sensor’s batteries might need replacing.
•  Move the receiver and the sensor closer to each other. 
•  Make sure that the sensor is placed away from 

electrical interference.

The functions are normal or 
certain functions do not work 
at all.

The unit needs to be reset. Do this by removing or 
replacing the batteries in both the receiver and sensor. 

Disposal

Disposal of this product should be in accordance with local regulations.
If you are unsure how to proceed, contact your local authority.

Specifications

Batteries 

Insert 4 x AAA/LR03 batteries (sold separately)

Size 

145 × 72 × 25 mm

Update interval 

1 minute

Humidity 

20–95 %

Indoor temperature 

-10 to +50 ° C

Outdoor temperature 

-50 to +70 ° C

1.  PM indicator
2.  Time
3.  Date/Month
4.  Indoor humidity
5.  Battery status indicator
6.  RF sensor
7.  Wireless transmission icon
8.  [ SET.ALM ] Alarm/settings
9.  [ 

/°C/°F ] Celsius/Fahrenheit selector

10. [ MAX/MIN ] Highest/lowest 
11. [ Reset ]
12. [ 

/12/24 ] Alarm on/off; 

Selecting the 12/24 hour display format

13. [ CHANNEL ]
14. Outdoor temperature
15. Outdoor humidity
16. Highest/Lowest icons
17. Indoor temperature
18. Alert ON 
19. Battery compartment
20. LED 
21. [ Reset ]
22. Base
23. Channel 1, 2 and 3
24. Battery compartment

Getting started

1.  Remove the battery cover on the back of the display unit. 
2.  Insert 2 x AAA/LR03 batteries. Note the polarity markings in the battery compartment. 
3.  Refit the battery cover. The display now shows the default time, calendar and present 

indoor temperature and begins searching for an outdoor temperature signal. 

4.  Insert 2 x AAA/LR03 batteries into the outdoor sensor. The outdoor temperature and 

“CH1” will now appear on the lower half of the display. The wireless thermometer display 
unit is now synchronised with the outdoor sensor on channel 1 and the temperature from 
that sensor is displayed. 

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