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 in experiments when I was a university student. #ScienceUniversity #Science #EngineeringDepartment ※ This is a used item that has been in someone else's hands. Please consider purchasing it only if you are satisfied with its condition. ※ Although I haven't checked all the functions, I have confirmed 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.