IRT 3020
IRT 3520
Changing the temperature scale
This thermometer is shipped with the Fahrenheit temperature scale activated. If you wish to switch to Celsius (°C), proceed as follows:
•Turn on the thermometer.
(If it is already turned on, make sure it is not in memory mode.)
•Press the 
/mem button and keep it pressed. Then press and release the activation button to switch over to the «change temperature scale» mode.
•By pressing the activation button again, the Celsius scale is activated, «°C» is displayed on the LCD. Each further pressing of the activation button toggles the scale between °C and °F.
•Release the 
/mem button to return to the ready symbol 
.
All temperatures stored in memory will automatically be converted to the selected scale when displayed on the LCD.
Changing the lens filter
The thermometer is supplied with a lens filter in place. To assure accuracy and sanitary practice, Braun recommends replacing the lens filter after each use. To install a new lens filter, first remove the one in place by pressing the lens filter ejector. Check the lens for any damage. Then take a new lens filter from the box, and hold- ing it by its edges, slide it onto the probe until it snaps in place.
Caution: Do not touch the tip of the probe or lens filters when installing. Fingerprints, ear wax, dust and other soiling compounds reduce the transparency, resulting in lower tem- perature readings (see also Care and cleaning).
Should you run out of lens filters and need to take a temperature, you may use the following lens filter cleaning procedure:
•Clean the lens filter without removing it from the thermometer with a soft cloth or cotton swab moistened with alcohol.
Do not use hot or boiling water.
•Dry completely with a soft cloth before reusing.
•Replace lens filter as soon as possible with a new one (LF 40 ).
•Additional lens filters (LF 40 ) are available at most stores
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