Calculator is very important & useful device in our day today life. I used to use Casio 991 MS in my college days. This calculator is very much reliable & its battery life is quite good. The battery of this calculator lasted for about 4-5 yrs. It is much durable one. It has many fonctional options in it & calculate everything efficiently.
Following are the calculators:
2-line display
Fraction calculations
Integration calculations
Combination and Permutation
Statistics
Base-n calculations / conversions
Logical operations
Complex number calculations
CALC memory
Engineering symbol calculations
40 scientific calculations
40 metric conversions(20 conversion pairs)
9 variable memories
Comes with slide-on hard case