2xCalc for

From Laura Watts:

2xCalc is a simple yet powerful calculator and universal converter: You can compute in any currencies and units: masses, temperatures, distances, pressures, volumes, etc.

Features include:

• 3 twelve-digit displays (one is fully customized)
• Automatic and instant conversion (on the fly)
• Double precision maths: +, -, x, /, +/-, %, 1/x and sqrt
• 2 calculation modes: RPN (as HP calculators) and algeabric
• Clear, STO/RCL and cut/paste with other applications
• Log of the last ten operations you performed
• Currency rates are refreshed every week via Internet.