Proficient knowledge of:
1) industrial equipment, including mining, iron & steel-making, rolling, tinning, galvanizing, water treatment plants, utility supply, electrical control and automation systems, electrical equipment and tools
2) manuals, guides, certification etc...
3) communications, network solutions and equipment,
4) financial markets, including commodity exchanges, stocks, on-line trading, back-office transactions, futures, forex and options trading, technical and fundamental analysis

usually from 0.4$ up to 0.8$ depending upon the volume, urgency etc... Anyway the rates are negotiable.