Calculator model Casio fx 991ms. Just received it as a prize from school today. Haven't used it for even a single day. All papers for the calculator are intact. The school mistakenly gave a cover for Casio fx 991 ES plus, which is why the calculator cover is different. The reason for selling is that I already have an extra calculator. Note: Price is slightly negotiable. You must come and inspect it in person. Its original price is Taka. I will sell it at a 45% discount.