Today scales are available in many different forms and have a myriad of uses. They are part of everyday life and have a long history of use in society. The word scale, which is used to refer to a device that measures the weight or mass of an object or person, is actually using a shortened version of the phrase "weighing scale". Weighing scales have been used, in various forms, for centuries. Some sources place the invention of the first scale, the balance scale, in the Middle East as early as the year 4000 B.C.

Digital hanging scales are electronic versions of hanging spring scales. A spring scale is a weighing scale that measures the weight of an object by determining how much force the object exerts upon a spring which is enclosed in the body of the scale. Spring scales can be divided into two different categories: scales in which the spring stretches and scales in which the spring is compressed. This article will only focus on scales in which the spring is stretched by the item being weighed, or hanging scales.

Whenever the amount of a liquefied gas in a gas cylinder needs to be determined, a number of problems are uncovered. It would be reasonable to try to measure the contents by measuring the gas pressure. But liquefied gas tanks will show full pressure if there is any gas at all in the tank. This is because the liquid will “boil” into gas. As soon as the liquid is depleted, the full pressure will quickly drop to no pressure at all. Another method is to use a sight gage on the side of the tank. This is usually not at all practical. The most effective method is to weigh the tank and its contents on a cylinder scale. This type of industrial scale, manufactured by Arlyn Scales, has a very low profile [+]

Scales are used to measure weight. Flow meters are used to measure the rate of flow of a liquid or gas. But in some situations, it is possible to utilize a high quality industrial scale to perform both functions. Sometimes this may be done for the purpose of saving the cost of the flow meter. In other cases, because of the type of liquid or the nature of the application, it is not practical to use one. A small container of liquid or liquefied gas may be weighed on a bench scale or cylinder scale. Larger tanks will be weighed on platform scales, drum scales or floor scales. In all of these cases, a highly accurate industrial scale can detect very small changes in the weight of liquid in [+]