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2026-11-06
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Hewlett Packard HP 28S Advanced Scientific Calculator with Original Case Vintage
$125.00
$162.5
30% OFF
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Product Details
Description
Specifications
Care Guide
Vintage Hewlett Packard HP 28S Advanced Scientific Calculator comes with its original black leather-style protective case. This professional-grade graphing calculator features a dual-screen clamshell design with a full alphanumeric keyboard and a dedicated mathematical keypad. Renowned for its Reverse Polish Notation (RPN) and symbolic calculation capabilities, it serves as a powerful tool for engineers, students, and collectors of classic computing technology. The unit is well-preserved with clear labeling and responsive buttons. Brand: Hewlett Packard Model: 28S Type: Advanced Scientific Graphing Calculator Input Method: RPN (Reverse Polish Notation) Display: LCD Clamshell Keyboard: Alphanumeric & Numeric Case: Original HP Branded Soft Case Power Source: Battery Operated Color: Black/Gray Material: Plastic/Leatherette Keywords: Vintage Tech, Engineering Tool, Math Geek, Retro Computing, RPN Calculator, Scientific Instrument, HP28S, Graphing Calculator, Collectible Electronics, STEM, Physics, Calculus
Daily Cleaning: Use a soft brush or damp cloth to gently wipe away dirt. Avoid harsh chemicals. For mesh areas, use diluted mild detergent and a soft brush.
Drying: Air dry in a cool, shaded place after cleaning. Avoid direct sunlight or high heat, which can cause fading and glue deterioration.
Storage: Stuff with paper to maintain shape when not in use. Store in a dry, ventilated area to prevent mold. Rotate between multiple pairs to extend lifespan.
Usage Notes: Designed for basketball. Not recommended for hiking, long-distance running, or other specialized sports where different performance features are required.