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Provides a continuous written record of high volume air sampler flow ratesAccurate to � 2% full scaleIncludes 60 charts and penMade in U.S.A.Specifications: Model FR-1 115 VAC, 60 HzModel FR-2 230 VAC, 50HzSize: 5-1/4 " x 5-1/4 " x 4" (13.3 cm x 13.3 cm x 10.2 cm)Weight: 2.5-lbs. (1.1 Kg)