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