The range (scale) of precision pressure gauges installed on boilers and pressure vessels should correspond to the equipment's working pressure. The measurement range of precision pressure gauges is generally 1.5 to 3 times the equipment's working pressure, with an emphasis on being at least twice as large. If the selected digital pressure gauge range is too large, due to the same level of precision, a larger range allows for greater permissible error and visual deviation, which can affect the accuracy of pressure readings; conversely, if the selected digital pressure gauge is too small, the equipment's working pressure equals or approaches the calibration limit of the precision digital pressure gauge, causing the elastic elements within the gauge to remain in a state of significant deformation for extended periods, leading to potential long-term deformation and increased error in the precision digital pressure gauge, as well as reduced lifespan. Additionally, a too small measurement range of the precision digital pressure gauge. During overpressure operations, the pointer spans a larger range, nearing zero, which can create a misconception for the operator, leading to more accidents. Therefore, the application pressure range of the precision digital pressure gauge should not exceed 60 to 70% of the scale limit.

The precision of a precision pressure gauge is expressed as a percentage of the allowable error to the dial's limit. The precision grade is typically marked on the gauge face. When selecting a precision pressure gauge, the precision should be determined based on the pressure rating of the equipment and the actual working requirements.

If the medium being measured by the precision pressure gauge is corrosive, different elastic element materials should be selected based on the specific parameters such as temperature and concentration of the corrosive medium; otherwise, the intended purpose will not be achieved.

Pay attention to daily usage and maintenance, conduct regular inspections and cleaning, and keep detailed usage records.

The general calibration cycle for precision pressure gauges is every six months. Mandatory calibration is a legal measure to ensure the reliability of the technical performance, accurate value transfer, and effective safe production of precision digital pressure gauges.