Summary: BUY THIS ONE FIRST. First of all I need to do math involving Inductor Resistor Capacitor Time Constants This involves millions multiplied times billionths. (20,000,000,000 times 0.000,000,000,200 etc.
Summary: Compact, durable desktop calculator. Could 10-key on this if desired. I even bought another, smaller version of the same calculator. This one is preferred. Just like Goldilocks, not too big, not too small. Just right. If you need a tape, that would be the main drawback.