Check the listing for details. Casio FX-991EX Classwiz No Cover (Works). Condition: Used, Made in United States. Listed at 13.99 USD. Casio FX-991EX ClassWiz Scientific Calculator – Tested Working (No Cover) Pre-owned calculator in used condition. The unit has been tested and is 100% functional. All buttons are legible and working properly. The protective cover is missing. Cosmetic wear is present from use. Please review all pictures carefully for more details about the cosmetic condition of the item. You will receive the exact calculator shown in the photos. Sold as-is. No returns.Casio FX-991EX ClassWiz Scientific Calculator – Tested Working (No Cover) Pre-owned calculator in used condition. The unit has been tested and is 100% functional. All buttons are legible and working properly. The protective cover is missing. Cosmetic wear is present from use. Please review all pictures carefully for more details about the cosmetic condition of the item. You will receive the exact calculator shown in the photos. Sold as-is. No returns.