I'm studying broadcast engineering at university and have been using a Casio fx-83ES however I've recently taken up a home study a-level in maths and have been recommended upgrading my calculator.
The Casio FX-991ESPLUS appears to be highly recommended but some people have said they prefer the non-plus version.
Can anyone please explain what difference the 'PLUS' makes? And is it really worth me upgrading from an FX-83ES to an FX-991ES?
Any advice appreciated.