An Air Filter Service Indicator provides a visual method to show the restriction level within the air intake flow path. Its function is to react to changes in air movement caused by filter loading and present a clear indication when airflow resistance reaches a defined threshold. By responding to the differential force created as air passes through the filter, the indicator displays a visible signal that can be checked during routine observation.Attributes:• Displays air intake restriction level visually.• Responds to airflow resistance changes.• Supports observation without system interruption.Applications: An Air Filter Service Indicator is used in the air intake system to visually indicate airflow restriction levels and guide filter service actions during operation.