Granit Engineering Hardness Converter ( http://www.graniteng.com/index_eng.php ) is a mechanical and metallurgical design application which performs conversions between different scales of surface hardness and tensile strength Rm.

It's the free offline version for Android (3.0 and later) of the well known online tool available at:
http://www.graniteng.com > Tools > Hardness Converter
Direct link: http://www.graniteng.com/tool_eng.php?subcontext=hardness_converter

Available scales:

- HV, 30 kg
- HK, 500 g load and greater
- HRC, 150 kg, brale indenter
- HR15N, 15 kg load
- HR30N, 30 kg load
- HR45N, 45 kg load
- HB, 3000 kg, 10 mm standard ball
- HB, 3000 kg, 10 mm tungsten carbide ball
- Rm [N/mm²]


Very quick and easy to use, it's currently available in English and Italian.