Good point about the calculators. First time around I had a piece of crap one with a crap battery. It's dual power but fat lot of good that did me in the Perth ASL dungeon. I should have asked for another but A. the clock was ticking and B. it was kinda good enough. You can bet I checked it the second time.
FRQ CB
Oh, I just practised with a dodgy little Casio (sqr rt button was in wrong place, that was my only hiccough).