Casio Calculators to calculate wavelength for radio amateurs

Using Casio Calculators to calculate wavelength for radio amateurs. Which modern calculator is difficult to use for this. The Casio FX-991CW classwiz gives incorrect answers until you use BIDMAS entry which is really awkward compared to the existing non classwiz calculators.
If you want a modern calculator for these types of radio or engineering calculations, stick with fx-300ES Plus or fx-570ES Plus2 style calculators etc, steer clear of the Casio calculators with model numbers ending with CW. Look for the EXP button and the x10x button type calculators.

[@VE6LK]

Well explained my friend. I think I'll stick to 300,000,000 / 14,200,000 on my calculator. Wait - I need a bigger calculator LOL. 73

[@va3sii]

Yes you will have to buy another calculator. A lot cheaper than my Hrwb purchases me thinks.

[@user-fg6ro]

Why are the solar cells covered, if I may know?

[@user-fg6ro]

The problem with 991CW is you have to use parentheses everytime, that is be very specific.

[@JohnUsp]

21.112