A: To avoid inaccurate measurements ALWAYS use this thermometer with a new, clean lens filter attached.
If the thermometer is accidentally used without a lens filter attached, clean the lens.
The lens filter indicator will blink to signal one is needed.
Attach a new lens filter by pushing the thermometer probe straight into the lens filter inside the box and then pulling out.
Note: The Braun ThermoScan will not work unless a lens filter is attached.
For the next measurement, press Eject button to remove and discard used lens filter, and put on a new, clean lens filter. For models without and eject button (ThermoScan 3 and 4), pull off lens filter and discard.