fx-913ES Scientific Calculator - Manufacturer: CASIO - Model: fx-913ES - Power Source: Solar - Features: Natural Display - Cover: Hard Cover Thank you for viewing. I used this during experiments when I was a university student. #ScienceUniversity #Science #EngineeringDepartment ※ This is a used item that has been handled by another person. Please consider purchasing with your understanding. ※ Although I haven't confirmed all functions, I have checked that it works. ※ Please refrain from purchasing if you are at all concerned or if you are a highly sensitive person. Returns and cancellations are not accepted.