Manufactures of calcium compounds which includes range of mineral gluconates, catering to nutraceutical, food and beverage sectors and more.

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http://www.globalcalcium.com

All you want to know about pH meters, pH measurements and pH electrodes. History, theory and practice, links to models and manufacturers.

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http://www.ph-meter.info

Easy to use programs for pH calculation, concentration conversion, solution preparation, equation balancing and stoichiometry with built in dissociation constants and density tables databases. Free extensive lectures on pH calculation and concentrations.

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http://www.chembuddy.com