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Online Conversion is a resource for weights, measures, calculators, converters.
ELVEX Reading Safety Glasses, RX-100, are the first reading glasses with a dual curvature mono-lens and integrated side shields.
A tool to calculate and convert between physical size, perceived size, and distance of an object.
Fractions Pro - fraction calculator with parentheses and exponents, fraction to decimal converter and decimal to fraction converter + fraction simplifier.