Casio FX-991EX Scientific Calculator Review

Casio FX-991EX Scientific Calculator Review
Footage taken from EEVblog Mailbag video #787

[LazerLord]

I honestly wouldn't mind you going through a lot of the features on a calculator. I'd definitely learn something.

[Veptis]

The best feature is variables.

Go into menu 1 and then write something like ax^3+bx^2+cx+d and then press CALC and it prompts you all variables, so great and so easy. It also remembers.

[adam]

the equal button works like an enter in the menu

[LazerLord]

Idea for filming future calculators: Have a separate view of the screen where it's the same video feed, but just zoomed in. I imagine that you could just have the keypad off to the side or something.

[Manawyrm]

I got this calculator when this mailbag video originally came out and have since used it at my HAM radio exam, it has been extremly helpful. Great tool and excellent value.

[theboots]

I teach HS Math here in the states and I'd never used a Casio calculator until I picked this exact model up on a whim a month ago. So glad I did. I love the thing, and I started recommending it to my students. At $20, it renders their school-required TI-8Xs pretty much obsolete (except for graphing). Only thing I hate are the slippery plastic feet.

[Michael-Sasser]

In Germany, we have the FX-991DE X model, which has a few more functions and is available for 3 years now, I think. It costs about AUD$25 locally. I love this thing and use it every day. But as you said, it would be verry nice to have the engineer symbols right on the numeric pad.

[wilbertbirdner]

oh look, it even have wireless power capability!

[fourtwozero]

I actually love the white/black combo!

[simaspudziuvelis]

It does have an enter key! It's the "equals to" button. I've had it for a few months. It is an amazing calculator.

[ewsclass]

in the UK the FX-991EX is the standard calculator in my college for A level Maths now

[MrFrazierNation]

2 years later, Dave, and you made the decision for me simpler. I was after a TI Nspire CX but for $15, IT CAN't BE BEAT! I lost my previous 2, so hey, need one. You are definitely right as well, having a calculator at hand beats phones and laptops anyday. I guess coming from an engineering / math teacher that's not news :)

[DivyanshMMMUT]

You can push (=) to select from the highlighted function from the menu!

[SproutyPottedPlant]

It looks so cool! Wish I was good at mathematics so I could take advantage of it's features.

[ColbrelliAdamsVideos]

What a great calculator! I ordered mine after seeing the Mailbag video a couple of years ago and I've used it every day since.

[ezravermeulen]

Used this one for over a year now, it's absolutely good! It is well available at my school in the Netherlands.

[iDrinkYourMilkshake]

The thumbnail makes it look like they are going to murder the calculator

[Ross_an_Artisan]

I purchased this in 2nd year of my engineering, best function veriable calculation

[Mr.MSTER]

I just bought this calculator recently. I am a die hard Sharp calculator user but everyone in my class at college seems to be buying the 991EX so I decided to purchase one to play about with and see what the fuss is about. Straight out of the box I don't like how the slide on cover fits over the front of the calculator when you would be putting in your bag or whatever it seems to stick out a bit. I also really hate the way it does not retain previous calculations after you turn the calculator off or hit the "on" button while using it, it just wipes all your previous calculations. That is what I love about the Sharp. It will retain previous calculations for ages, one time I didn't use my calculator for 2 weeks and my previous calculations were still on it when I went back. I will still use this Casio from time to time and I might grow to like it.

[mikesradiorepair]

I have been using this calculator for quite some time now and it is a great calculator. It's not a HP in build quality but for the money you can't beat it. One thing to be aware of is a trap that many calculators have, this one included. Doing something as simple as 6 divided by 2 times the sum of 2+1 you can end up with two different answers depending how you input it into the calculator. Input as 6÷2(2+1) you get the incorrect answer of 1. Input as 6÷2x(2+1) gives the correct answer of 9. Input this either way in another calculator like say a HP35S and it gives the correct answer of 9 both times. Just something to be aware/cautious of when using some calculators. This is something I check on every calculator I buy so I don'g get caught in the trap.