weights and measures
- Common equivalent weights and measures (http://physics.hallym.ac.kr/reference/scales/measures.html)
- Physical constants (weight of an atom, etc.) (http://www.astro.wisc.edu/~dolan/constants.html)
- Entisoft Measurements Conversion Calculator (http://entisoft.earthlink.net/scripts/unitscgi.exe)
- Measurements converter (http://www.mplik.ru/~sg/transl/)