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Amazon : http://www.amazon.in/Casio-FX-991ES-Plus-Scientific-Calculator/dp/B0034BAQS8?ie=UTF8&keywords=fx%20991%20es&qid=1480334958&ref_=sr_1_1&sr=8-1
Flipkart : https://www.flipkart.com/casio-fx-991-es-plus-calculator-scientific/p/itmeh7fhrjqsgzjn?pid=CALEH7FHCRVHGJXJ&srno=s_1_1&otracker=search&lid=LSTCALEH7FHCRVHGJXJQNPC4L&qH=e5bcb10481029329
It is a scientific calculator by casio, a well known and very popular brand. It can perform all of its functions very efficiently and has numerous of funtions much required for all the calculations an engineering student need to perform.
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Scientific how much it cost