It has not been functional since delivery. As we stay in Kenya we got this product at hand in week 1 of Jan. After that we thought the battery has died, hence we changed the battery 3 times. However despite this it isnt functional. Even it is not working on solar power. If the customer service can call me at +254-734871471 or write back at email@example.com shall appreciate.
Nothing much to say about the calculator. Cost effective most efficient one for this price but the delivery took a lot of time (3 days). Moreover this series has a display of 10+2 digit and it has a solar power as charging mode as well which is not mentioned in the description. Believe me friends it's the original product. Lastly I would like to add one more thing, another listing of the same product, they have mentioned it as 16 digit display which is futile but they have mentioned the charging mode correctly. This calculator comes with a 12 digit display only and not 16.
Excellent product. The product wasn't sealed pack so can't be sure about being an unused product but there wasn't any visible signs of usage so I guess I happy with the product. The product offers 3 year warranty by Casio. Also currently they are offering a scratch coupon codes which are valid till March 2018. Also it has solar powered cells.
I was in the market for a good calculator and this one from casio fit the Bill. The other choices were from HP and TI because I wanted to practice RPN notation. But these were priced higher than Casio. So I finally decided on the FX-991 EX. It has all the functions that a engineer needs with a spread sheet application too, And has all the constants an engineer needs for his work. My only dislike is that the display LCD is a little dark and requires a little bit of bright light to read the display
the calc is nice than the es version.In the 911es i can see the boxy pixals more often than this one,and this one looks more premium than that but the case(the cover used to slide on this calc) is white so my worry is that it will become dark grey after some months.This calc does not have any details on the cover like 911es,it is plain white,i got this product after 2 days of bookings without any extra delivery charges
Really great functionality. The 4X4 matrix solving ability makes it far better if you are dealing with that. The build quality is really great and feels lightweight but sturdy. I would however suggest you look for this model offline and check prices as I found the online price to be about ₹100 more than the offline ones.
Best calculator so far allowed in the exams. Display, design and interface are much improved in this model, and equations, matrices etc can be calculated of degree 4, 4x4 etc. The calculations are also much faster than the earlier models like 991es plus or 991ms, you can compare the speed by yourselves.