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, perhaps no stock market trend is more popular than value investing, which is a strategy that has proven to be successful in all sorts of market environments. 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 to watch right now is Unilever PLC (UL Quick QuoteUL - Free Report) . UL is currently sporting a Zacks Rank of #1 (Strong Buy), as well as a Value grade of A. The stock is trading with a P/E ratio of 19.80, which compares to its industry's average of 21.63. UL's Forward P/E has been as high as 21.52 and as low as 18.18, with a median of 19.29, all within the past year.

Another valuation metric that we should highlight is UL's P/B ratio of 4.63. The P/B ratio pits a stock's market value against its book value, which is defined as total assets minus total liabilities. UL's current P/B looks attractive when compared to its industry's average P/B of 5.10. Over the past 12 months, UL's P/B has been as high as 4.85 and as low as 4.05, with a median of 4.44.

Value investors will likely look at more than just these metrics, but the above data helps show that Unilever PLC is likely undervalued currently. And when considering the strength of its earnings outlook, UL sticks out at as one of the market's strongest value stocks.