Library of Things C-PEN C-PEN Portable scanning pen which reads printed text out loud. Optical character recognition (OCR) and natural voice text to speech. Energy Efficiency Toolkit Energy Efficiency Toolkit Contains an electric use meter to test home appliances and thermometers to test refrigerator/freezer and room temperatures. Outdoor Explorer Backpack Outdoor Explorer Backpack Includes binoculars, trail guide, local nature identification guides, temporary parking pass, and membership card for any EBRP facility. Stories to Go Kits Stories to Go Kits Stories to Go are early literacy kits with over 50 themes for babies and young children. Ukelele Kit Ukulele Kit Ukuleles are available for check out from the Hercules Library. Call (510) 245-2420 for reservations. Return this Kit only to Hercules. Raspberry Pi Raspberry Pi The Raspberry Pi is a tiny computer that you can use to learn programming through fun, practical projects.