Allowed in every UK exam where a calculator can be used. The Casio fx-991 CW is Casio’s most advanced scientific calculator with 540 + mathematical functions. Functions include: QR code to display graphic representation, Powers, roots, reciprocal, fraction calculations, Advanced statistics, Table of values, Ratio, Equation / Matrix / Vector / Inequality / Probability and Complex Number Calculations, Base-N function (hexadecimal/decimal/binary/octal), Random decimal and integer generator, Hours (Degrees)/minutes/seconds.
Casio FX-991CW the best calculator I have had - so far
Online manual is ok but the pdf version is better.
The physical constants are not explained as to their meaning. Maybe Casio assume if you need the value you'll know the symbol and the units. I noticed at least one value is fractionally different from the latest values.
I hope the next generation of calculators will have units and unit conversions built into the arithmetic e.g. X feet squared times Y psi equals Z kN per metre squared.