A calibration image including dots and scale points is projected at first and second display surfaces. In one embodiment, multiple object store pages are maintained in device SRAM that is configured to be battery backed in an event of a power loss. As a P2P participant accesses a link metrics are recorded about the P2P network being used by the participant. In the second mode the system preferably enabled after detection of an object in the first mode, uses chemical detection methods such as Nuclear Quadrupole Resonance.