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The OSALO OS-991ES PLUS Scientific Calculator handles 417 mathematical functions across a natural textbook display. With dual power through solar cells and LR44 batteries, it maintains performance in various lighting conditions. Durable ABS plastic protects the 12-digit interface from physical stress.
Key Features
- 417 Math Functions: Covers matrix, vector, and base-n calculation modes. Solves high-level engineering problems during university lectures.
- Natural Textbook Display: Renders fractions and square roots in standard written format. Reduces errors when inputting complex trigonometric equations.
- Dual Power Supply: Combines solar energy with an LR44 backup battery. Prevents shutdown during dim lighting or indoor study sessions.
- Slide-on Hard Case: Includes a rigid ABS plastic cover for the keypad. Blocks road dust and humidity from entering button gaps.
- 6-Month Official Warranty: Validates hardware reliability against factory defects. Offers a replacement window for students in Bangladesh.
Frequently Asked Questions
Is OSALO OS-991ES PLUS allowed in board exams?
Most education boards permit non-programmable models lacking text storage capabilities. Confirm specific institutional guidelines to verify compliance before the test.
How to change battery in OSALO 991ES PLUS?
Unscrew the rear panel to access the internal LR44 button cell. Swap the battery once the digits fade in dim environments.
