20 Most Recent Braun Thermoscan Pro 4000 Ear Thermometer Questions & Answers

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You did not provide a model number however the Instruction Manuals for the various Braun Thermometers can be found here:

http://braun.kaz.com/kaz/service/prodResult/

Not sure if this procedure is common to all but this may work otherwise find the manual specific to your model number.

Changing the temperature scale

This thermometer is shipped with the Celsius temperature scale activated. If you wish to switch to Fahrenheit ( °F), 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 Fahrenheit scale is activated, «°F» 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 . The temperature stored in memory will automatically be converted to the selected scale when displayed on the LCD.

If you whish to switch from Celsius to Fahrenheit, proceed as follows:

(1) Make sure the thermometer is turned off.

(2) Press and hold down the Start button (IRT 4020)
or the «I/O» button (IRT 4520). After about
3 seconds the display will show this sequence:
«°F» / «SET» / «°C» / «SET» ...

(3) Release the Start button / «I/O» button when the
desired temperature scale is shown. There will be
a short beep to confirm the new setting, then the
thermometer is turned off automatically.

Replacing the batteries The thermometer is supplied with two 1.5 V type AA (LR 06). For best performance, we recommend Duracell ® alkaline batteries. Insert new batteries when the battery symbol appears on the display. Open the battery compartment. Remove the batteries and replace with new batteries, making sure the poles are in the right direction. Slide battery door back until it snaps in place. To protect the environment, dispose of empty batteries at appropriate collection sites according to national or local regulations.

no I contacted customer service, this thermometer reading ONLY in F, there is no option to change it to C