Tools for Weighing

There are four classes of balances, each based on their ability to split hairs as it were, or, more specifically, based on the number of intervals used within the scale capacity. For example, if a laboratory balance has a capacity of 200.00 grams and it reads to two decimals, it would have 20,000 scale intervals. The formal identifi- 

Balances can be calibrated or verified for accuracy with special weights, called calibrated weights, whose specific mass is known. Calibrated weights vary in quality and tolerance. They are classified by type, grade, and tolerance All calibrated weights are compared directly or indirectly to the international prototype one-kilogram mass to verify their accuracy. 

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The best tools for weighing the various aspects are quantitative expressions of properties and performance data valid under various conditions, such as corrosion rate and distribution, lifetime in eorrosion fatigue, mechanical or electrochemical threshold values (Kiscc, Kthi Ep etc.), compared with corresponding quantified requirements or service conditions, i.e. specified lifetime, actual stress intensity factors and functions, and corrosion potential. 

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