- Free Unit Convertor - Online conversion of area, density, energy, force, length, mass, power, pressure, speed, temperature, volume and bytes.
www.flowmeterdirectory.com/flowmeter_unit_converter/index.htm
- Martindale's 'The Reference Desk: Calculators On-Line' - A very extensive set of Java script based online calculators covering many subjects.
www-sci.lib.uci.edu/HSG/RefCalculators.html
- Pumpuniversity: calculators, conversion programs and theory - On line calculators, conversion programs and theoretical information on pumps.
www.pumpuniversity.com
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