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Luber-finer's air-filter restriction gauges have the capability to measure the air-flow resistance in a vehicle's air-intake system. This is done by measuring the amount of vacuum that is created when the air travels through the filter. When the filter has reached the end of its useful life, the air-restriction gauge alerts the driver that the filter needs to be replaced. Knowing exactly when the air filter needs to be replaced not only protects the engine, but also saves time and money in reduced filter changes, maintenance and vehicle downtime.