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Weight scales are important gadgets used in the homes, hospital, groceries, industries and in almost all places and circumstances. While weight scales are almost always associated with weight, they are actually measuring the mass of object as well. Mass is the total make up of the body independent from the force of gravity which acts on it. On the moon for example, the weight of a person may vary but the mass stays the same.
There are many kinds of weight scales varying in sizes and weighing capacities. Some may be as small as a suspended ballpen and others may be as big and wide as a typical sleeping mat. Weight scales vary in calibration. The different units of measure include grams and pounds. Many weight scales can handle objects are heavy as several thousands of kilograms especially those scales used in heavy industries. The most common type and easily distinguishable weight scale is the bathroom weight scale which is found in million of homes around the world. Supermarkets use weight scales commonly in seafood, fruit, deli, bakery, produce, meat and other perishable sections. Many weight scales used in groceries and supermarkets feature automatic price computation corresponding to the weight output. They are electrically powered. The use of weight scales is very important so much so that many countries regulate the servicing and design especially those weight scales used in commercial activities. The weight scales is checked by licensed technician to find out potential discrepancies. Many countries in fact make periodic check up of weight scales. Some sources of error for weighing scales include buoyancy, friction, misalignment of some mechanical components, magnetic field acting on electrical writing in electronic weigh scales and vibration or seismic disturbances.
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