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An incorrect reading (around 2°C lower) can be measured if the ear canal is not straightened correctly. The ear canal is not identical in each ear; this can result in a slight difference in some individuals. 

It is therefore important to straighten the ear canal prior to taking a reading. For children under 2 years old, gently pull the ear back. User technique is critical.

The instructions for use advise that three readings should be taken, with the highest being the one which is registered. The unit measures the infrared heat generated by the eardrum.