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The unit of the main scale of a pressure gauge is the unit of measurement in which the measured pressure value is displayed. Typical units for the main scale of a pressure gauge are: - Bar (bar) - Pascal (Pa) - Kilopascal (kPa) - Pounds per square inch (psi) - Kilograms per square metre (kg/cm²) The selection of the unit for the main scale depends on the specific requirements of the application and the region. Further information can be found in the following video: <iframe width="560" height="315" src="https://www.youtube.com/embed/b70uwtUaGs8?si=FfeEgrudrktswQta" title="YouTube video player" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share" referrerpolicy="strict-origin-when-cross-origin" allowfullscreen></iframe>

The scale range of a pressure gauge defines the scale start value and full scale value of the scale printed on the dial of the pressure gauge. The correct scale range depends on the process pressure of the respective application and the process conditions. There are predefined standard scale ranges for pressure gauges in accordance with European and American standards. For special display ranges, please contact WIKA support. Ideally, the process pressure of the application should be approx. 2/3 of the full scale value of the pressure gauge. Example: For a process pressure of 40 bar, for example, a pressure gauge with a scale range of 0 to 60 bar would therefore be recommended.

A second scale is an additional scale in a different pressure unit, which is printed directly next to the main scale on the dial. This makes it possible to read the displayed pressure in two different units at the same time, without manual conversion from one unit to another. A special scale is a customised scale that deviates from the predefined scale ranges of the standards. An example of this would be a pressure gauge that indicates both bar and psi. Overall, a second scale thus offers more flexibility and user-friendliness.