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A two stage design has two rotors and vanes. This means that the first stage generates vacuum and the second stage cleans the system, leading to a deeper ultimate vacuum level. As a result, two stage pumps can produce a deeper vacuum than single stage pumps.

Different types of pumps for these vacuum ranges can then be divided into Primary (Backing) Pumps, Booster Pumps and secondary (High Vacuum) Pumps: High, very high and ultra-high vacuum pressure ranges. There are two basic categories of vacuum pump: Gas Transfer Pumps and entrapment or capture pumps.

As the name suggests, a handheld vacuum is typically a smaller, portable version of the traditional vacuum cleaner. Because of its compact size, it comes with its own set of pros and cons. The most obvious con being that it is not a good solution for vacuuming large areas of your home.

Vacuum pump mechanism is used to remove air or any gas particles from the container that creates vacuum in the vessel. It is used for various industrial applications. It is used in electronics manufacturing units to produce CRT tubes, electric bulbs and lamps, semiconducting materials, glass coating etc.

The main point of a handheld vacuum cleaner is convenience, so weight and size are of paramount importance. Handheld vacuum cleaners vary in weight, from 0.7kg to 2.3kg - although most are around 1.5kg.

The amount of dust handheld vacuum cleaners can hold varies, so it's worth looking out for the highest capacity. The higher the dust capacity, the longer you'll be able to clean for without having to empty your vacuum.Handheld vacuum cleaners have a smaller dust capacity than other vacuum cleaners - around 0.5 litres compared with up to 5 litres fo