DPLS Science Calculator is a scientific calculator that can also calculate molecular mass, and from this main calculator over 60 other calculators can be called, as well as numerous converters, science tools, tables of reference data and a science glossary system.

The calculator is a freeware version of the full version that can be purchased for minimal cost.

Limitations:
* The following features are not available in the unregistered version: common compounds, conversion factors, common constants, vector addition, number converter, molar mass, significant figures, quardratic calculator, electrical calculator

The license of this software is Free Trial Software, the price is $3.00, you can free download and get a free trial.