NEW YORK ( TheStreet) -- Shares of Zoll Medical Corporation (Nasdaq: ZOLL) were gapping up Thursday morning with an open price 15.5% higher than Wednesday's closing price. The stock closed at $35.66 Wednesday and opened today's trading at $41.20. The average volume for Zoll Medical has been 353,700 shares per day over the past 30 days. Zoll Medical has a market cap of $834 million and is part of the health care sector and health services industry. Shares are up 1.2% year to date as of the close of trading on Wednesday. ZOLL Medical Corporation develops, manufactures, and markets resuscitation devices and related software solutions worldwide. The company has a P/E ratio of 31.4, equal to the average health services industry P/E ratio and above the S&P 500 P/E ratio of 17.7. TheStreet Ratings rates Zoll Medical as a buy. The company's strengths can be seen in multiple areas, such as its revenue growth, largely solid financial position with reasonable debt levels by most measures, impressive record of earnings per share growth, compelling growth in net income and expanding profit margins. We feel these strengths outweigh the fact that the company shows weak operating cash flow. You can view the full Zoll Medical Ratings Report. Get more investment ideas from our investment research center. Interested in other stocks that are gapping up? Get free SMS text alerts sent to you when the action happens by texting UP to 95370 or select from multiple alert options.