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The CASIO CSOMS80B is a desktop tax calculator built for reliable, everyday calculation work in office and accounting environments. It features an 8-digit display with the ability to perform 16-digit approximations, a large easy-to-read screen, and dedicated functions for tax calculation and currency exchange. Powered by solar energy with a mercury-free battery backup, it maintains consistent performance in a range of lighting conditions. Arithmetic constants for addition, subtraction, multiplication, and division are built in, along with independent memory, markup percent calculation, and three-digit comma markers for quick number parsing. Accounting professionals, bookkeepers, and office staff are the primary users.
The CSOMS80B is suited for desktop use in office environments where tax computation, currency conversion, and general arithmetic are routine tasks. Its solar-first power design reduces battery dependency, while the mercury-free backup battery ensures uninterrupted operation in low-light conditions. The compact footprint makes it practical for shared workstations or individual desk setups.
Designed as a standalone desktop calculator suitable for general office, accounting, and administrative use where tax and currency functions are required.
No installation is required. Place the unit on a flat desktop surface with adequate ambient light for optimal solar charging. If replacing the mercury-free backup battery, follow the battery replacement instructions in the product manual and dispose of the old battery in accordance with local regulations.
We pulled together the parts most installs need for this unit, plus a few add-ons worth a look. Check what you need — nothing here blocks checkout.
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