Environmental conditions
Accessories
Network
User placement
1
Stand between 70 and 80 cm of your device to obtain the best accuracy
2
Place down the device on the support in order to be fully stable.
3
Make sure your ears are visible
4
You can keep your eyeglasses on
5
If lighting conditions provide too many reflection, try without glasses
6
Once requested, place the card, flat and centered over your mouth
Device
do the PD measure manual with a ruler (link)