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The Gilian 5000 is an industry leader in back-pressure performance, reliability and ease-of-use. The 5000 offers flow rates up to 5000 cc/min. And thanks to several advanced features, this pump overcomes the main causes of sampling errors - saving you time and money. The air flow display holds calibration for 30 days, even with atmospheric changes. While Gilian air sampling pumps are known for their strength, the back-pressure capabilities of the Gilian 5000 are the highest in the industry for any personal sampling pump.