Pall Corp.'s (PLL) fiscal third-quarter profit dropped 30% as the stronger dollar weighed on the filtration and water-purification products maker's revenue and margins fell.

Following the results, which included lower-than-expected revenue, shares were down 4.8% at $25.55 in after-hours trading. Pall's stock has lost about a third of its value from September, but has rebounded from its more than six-year low of $18.20 in March.

For the period ended April 30, Pall reported earnings of $44.2 million, or 37 cents a share, down from $63.3 million, or 51 cents a share, a year earlier. Excluding restructuring and other items, earnings fell to 42 cents a share from 54 cents.

Revenue declined 16% to $555.9 million, but would have decreased 6.1% in local currencies. Pall generates a bulk of its revenue from outside of the U.S., making it more susceptible to currency changes.

Analysts polled by Thomson Reuters expected per-share earnings of 42 cents on revenue of $564 million.

Gross margin fell to 47.5% from 48.8%.

Sales from the company's life-sciences segment dropped 6.6% to $236.3 million, while sales from its industrial segment decreased 22% to $319.6 million.

-By John Kell, Dow Jones Newswires; 201-938-5285; john.kell@dowjones.com