While the proven Zacks Rank places an emphasis on earnings estimates and estimate revisions to find strong stocks, we also know that investors tend to develop their own individual strategies. With this in mind, we are always looking at value, growth, and momentum trends to discover great companies.

Of these, value investing is easily one of the most popular ways to find great stocks in any market environment. Value investors use a variety of methods, including tried-and-true valuation metrics, to find these stocks.

Luckily, Zacks has developed its own Style Scores system in an effort to find stocks with specific traits. Value investors will be interested in the system's "Value" category. Stocks with both "A" grades in the Value category and high Zacks Ranks are among the strongest value stocks on the market right now.

One company value investors might notice is Sony . SNE is currently sporting a Zacks Rank of #1 (Strong Buy), as well as an A grade for Value. The stock is trading with a P/E ratio of 11.69, which compares to its industry's average of 12.83. SNE's Forward P/E has been as high as 17.59 and as low as 10.85, with a median of 13.19, all within the past year.

Investors should also note that SNE holds a PEG ratio of 1.16. This popular figure is similar to the widely-used P/E ratio, but the PEG ratio also considers a company's expected EPS growth rate. SNE's industry has an average PEG of 1.26 right now. SNE's PEG has been as high as 2.68 and as low as 1.16, with a median of 1.94, all within the past year.

These are only a few of the key metrics included in Sony's strong Value grade, but they help show that the stock is likely undervalued right now. When factoring in the strength of its earnings outlook, SNE looks like an impressive value stock at the moment.