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Why ZOLL Medical May Be About to Take Off

Seth Jayson
January 4, 2012

Here at The Motley Fool, I've long cautioned investors to keep a close eye on inventory levels. It's a part of my standard diligence when searching for the market's best stocks. I think a quarterly checkup can help you spot potential problems. For many companies, products that sit on the shelves too long can become big trouble. Stale inventory may be sold for lower prices, hurting profitability. In extreme cases, it may be written off completely and sent to the shredder.

Basic guidelines
In this series, I examine inventory using a simple rule of thumb: Inventory increases ought to roughly parallel revenue increases. If inventory bloats more quickly than sales grow, this might be a sign that expected sales haven't materialized. Is the current inventory situation at ZOLL Medical (Nasdaq: ZOLL  ) out of line?

To figure that out, start by comparing the company's inventory growth to sales growth. How is ZOLL Medical doing by this quick checkup? At first glance, pretty well. Trailing-12-month revenue increased 18%, and inventory decreased 5.8%. Over the sequential quarterly period, the trend looks healthy. Revenue grew 11.6%, and inventory grew 0.1%.

Advanced inventory
I don't stop my checkup there, because the type of inventory can matter even more than the overall quantity</