A stock screener is an online tool that allows users to search for stocks based on certain criteria. Some of the most popular stock screener tools include The Motley Fool's CAPS and Morningstar's Stock Screener. When using a stock screener, it is important to understand the different types of screens that are available. 

There are fundamental screens, which look at a company's financial statements and determine whether or not the stock is overvalued. To get more details about the best online stock screener you may see it here.

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There are also technical screens, which focus on factors such as a company's price-to-earnings (P/E) ratio and its daily trading volume. Finally, there are sector screens, which examine the industry in which the company operates.

Stock screener tools can be helpful when trying to identify undervalued stocks. However, it is important to remember that stock screener tools are not infallible; they are only as good as the data that is used to create them. So always consult with a financial advisor before making any investment decisions.

To get the most accurate results from your stock screener, it's important to understand how each type of analysis works. The financial analysis looks at a company's overall financial condition, including its net income, cash flow, and debt levels. 

Historical performance analysis looks at how a company's stock has performed over the past few years and factors in future prospects. Analyst ratings assess the quality of a given analyst's research on a particular stock.