I recently acquired a couple of calculators that were in essentially "new" condition: 48GX and 28C. Both had significantly "tighter" keyboards than others I own, including another 48GX with black screen and 28S. Also, the first HP I owned (and still do), a 32SII also still has a "tight" feel.
Here's my question. Does a looser keyboard, including keyboard "bounce" develop from excessive use? Or have I just taken abnormally good care of my 32SII? I teach chemistry at the college level and have used my 32SII nearly every day during the academic year for the past 13 years. Or are some models more susceptible to keyboard degradation than others?