ANSWER
A size estimate is reported in every Touch Notification, which can be accessed in Workbench, SDK, or through the Arduino Library. However, since the sensor only emits light from one direction, it is able to see solely one side of the touching object. Please note that the size calculation is only an estimate. Since the sensor module only scans the touch object from one direction, the estimation might differ depending on the touch objects size, shape, and color/translucency.
Please contact Neonode Support team for further information.
Kind Regards,
Neonode Support Team