Step-1
Aim the thermometer probe at the center of the forehead from less than 1.18 in (3cm) away.
Step-2
Gently press the measurement button to begin the test.
Step-3
The thermometer vibrates noiselessly once the reading is complete.
*credit to Sylvain of iHealth Labs EU
https://helpcenter.ihealthlabs.eu/hc/en-gb/articles/360007204257-iHealth-PT3-How-to-use-the-thermometer