Magnifying glasses (optics); Microscopes; Optical scanners, other than for medical use; Measuring instruments; Binoculars; Telescopes; Sighting telescopes for firearms; Cell phones; Cameras; Tripods for cameras; Eyewear; Microscope slides; Passive infrared detectors; Monoculars; Optical lenses; Eyepieces; Dry-cell batteries; Tablet computers; Electronic scanners; Headphones