I have a Braun ThermoScan Type6013 have changed batteries twice but keeps coming up LO when try to read a temperature, any ideas?

Question edited for clarity, and spelling 'brain' to Braun, and 'thermoter' to thermometer, 'comes in' to comes on..
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There are some ideas here, but it sounds faulty and needs warranty return or repair.

https://www.google.com/search?q=Braun+thermoscan+hm3+not+working

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1. Memory mode.
2. IRT 3020. The last stored temperature is displayed along. with the MEM symbol. ...
3. IRT 3520. This model allows you to store up to 8 temper- atures. ...
4. Memory clear. Press the /mem button for 5 seconds to clear. the temperatures stored in memory. ...
5. LCD light (model IRT 3520 only) For easy nighttime reading.

https://www.manualsdir.com/manuals/50884/braun-thermoscan-irt-3020-thermoscan-irt-3520.html?page=9

It's probable that it needs a new lens filter or the filter needs cleaning. I have no idea how to remove the filter but it probably clips or screws off the bit that goes in the ear.
Quite frankly the device is at best unreliable, it measures infra-red in the ear, great in theory but not very reliable in practice. I would use a different thermometer.

Have you tried replacing the disposable-lens filter ?
The manual is available at: http://brauntherms.com/downloads/IRT4020_4520_MNLA_U.0035_OM_25JAN11.pdf

this is manual for 6022.. Braun Shaver Owner Manual ManualsOnline com

is the drawer that its stored in, in the bathroom? the humidity or moisture could affect it. I have had mine for 8 yrs and works perfectly. Are you placing the probe covers on correctly and waiting for it to click or a pop before inserting into ur ear.?

I have the same LO error msg. too... and it continues even though i followed the manual instructions.

Turn off the thermometer
Press and Hold the L/O Button
Continue to hold the start button when the F or C display appears. Watch for these displays to cycle over the display window.
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Release the start button when the F display appears on the screen.
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5

Listen for a beep and watch for the Braun ThermoScan ear thermometer to shut itself off, indicating that you changed the temperature scale to Fahrenheit successfully.
#
6

Follow the same procedure but release the start button when C shows on the display to switch from Fahrenheit to Celsius.