The calculator on the left is the one I got used to.
The one on the right is the one they later replaced it with.
They both fit my hand perfectly.
They stopped making the one on the left, then they stopped making the one on the right.
I should have bought 1,000 of them.
Sadly, they're not solar so, at some point, the battery dies (yes, I've taken them apart and put in new batteries...they won't restart...yes, I bought the correct batteries).
Someone has a pallet of these somewhere in Asia or San Diego and I'd love to buy them.