









📐 Elevate your equations — never miss a calculation beat!
The OA-991EX Scientific Calculator packs 552 functions including advanced algebra, statistics, and matrix operations into a sleek, ultra-light design. Featuring a high-resolution multi-line display and a quad-core processor, it delivers fast, clear calculations. Dual solar and battery power ensure long-lasting use, while a durable sliding cover protects it during intense study sessions. Perfect for middle and high school students and teachers aiming for precision and efficiency.








ترست بايلوت
منذ يوم واحد
منذ شهر
منذ شهر
منذ أسبوعين