UniSolver UniSolver scientific calculator performs calculations by including the units with the numbers. Calculations have never been easier when SI and US Customary systems are mixed. You can now add 1.5 m to 1.6 ... Cost: $39 Buy full version       Trial version       Publisher: Delta Engineering Corporation     Descriptions UniSolver: UniSolver scientific calculator performs calculations by including the units with the numbers. Calculations have never been easier when SI and US Customary systems are mixed. You can now add 1.5 m to 1.6 ft without prior or post conversions. UniSolver speeds calculations and increases accuracy by including the units with the numbers. Unlike handheld scientific calculators that allow inclusion of the units only from menus, UniSolver allows the user to type the unit abbreviations with the number or select from the Units Selector. The UniSolver program is a free program for 30 days. There is no risk so download one and try it.