Prism Spectrum Clarity: Full-spectrum prism optics help reveal gemstone absorption lines clearly, including darker blue and violet areas for more confident observation. Adjustable Focus: Fine focus design makes it easier to sharpen the spectrum under different lighting conditions, helping both beginners and experienced users read results. Compact & Portable: Pocket-size 18 x 75 mm body weighs about 36 g, making it easy to carry in shops, shows, classrooms, labs, and field identification work. Protective Leather Case: Comes with a durable leather case for safer storage and convenient carry, helping protect the spectroscope during travel and daily use. For Gem Testing & Appraisal: Ideal for gemstone identification, jewelry appraisal, mineral study, and educational use through transmission, reflection, and observation tasks.