Casio FX-991ES / FX-991-ES-PLUS Calculator

This calculator is really great! My roommate has had this calculator for all of college so far (we are seniors) for engineering work, and he loves it. After getting this and getting used to it, I really love it. The ability to go back and modify equations and also to do differential and integral calculus is very useful.

Great price - works great

Amazing calculator does everything you would want on something that's not a GDC

My favorite calculator ever.

Good

I think the calculator is a good one, but the manual that came with it was in Chinese or some other oriental language - just a flimsy and impractical fold out in English. I returned the first one I got for that reason, with assurance from the Amazon rep that the next one should have a manual in English. Unbelievable! I don't really fault Amazon, but the seller, Port Trading US. Product should have been clearly marked as having manual in Chinese, and not English. My daughter is leaving for college in next day or so, so she'll just have to download a pdf and deal with it.

Does it's job. Doesn't have a Mod button - but a decent calculator overall.

good calculator, but wrong model.

とても使い易くデザイン的にもGOOD!!机の上に置いても絵になります。 ボタンは堅めのプラスチック。ダイレクトな反応。 コントラスト調整できるのも良いですが フルドットディスプレイは、とても視認性が良く効率があがる気がします。 「数学自然表示」は、今までのモノとは違い 一目で頭に入ってくる感じ。 疲れている時の誤入力を確実に減らしてくれる事と思われます。 マルチなものでありながら細部にもこだわりがあり 価格以上の出来だと感じました。

No me llegó este modelo sino otro peor y le falla la función solve ( la respuesta es siempre can’t solve) que es era lo más importante para mí, así que muy mal.

This is exactly what my son wanted

Its Multifunctional and pultipurpose with so many functions that allow users to perform complicated calculations.

ottima per tutti coloro che non lavorano semplicemente con i "numerelli" , ma usano anche notazioni fratte , devono integrare e derivare funzioni . In poche parole è la calcolatrice PERFETTA