Not good for real scientific computations

Missing +/- button
Division by 1e6 and more rounds result to 0!
Missing exponent button (E), cant write .47e-8, have to write .000...47 or 0.47/100000000, but if you use division to get e-8 it will round result to 0 after pressing =. Very bad.
Looks nice, therefore 2 stars.

Yvonne@jp about CALC Smart Calculator ±, v2.4