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.

Looking at the history of these trends, perhaps none is more beloved than value investing. This strategy simply looks to identify companies that are being undervalued by the broader market. Value investors rely on traditional forms of analysis on key valuation metrics to find stocks that they believe are undervalued, leaving room for profits.

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 ABM Industries (ABM). ABM is currently holding a Zacks Rank of #2 (Buy) and a Value grade of A. The stock is trading with a P/E ratio of 13.93, which compares to its industry's average of 35.06. Over the last 12 months, ABM's Forward P/E has been as high as 15.99 and as low as 11.73, with a median of 13.96.

We also note that ABM holds a PEG ratio of 2.69. This figure is similar to the commonly-used P/E ratio, with the PEG ratio also factoring in a company's expected earnings growth rate. ABM's PEG compares to its industry's average PEG of 5.64. ABM's PEG has been as high as 2.96 and as low as 2.58, with a median of 2.68, all within the past year.

Finally, investors will want to recognize that ABM has a P/CF ratio of 17.79. This figure highlights a company's operating cash flow and can be used to find firms that are undervalued when considering their impressive cash outlook. ABM's current P/CF looks attractive when compared to its industry's average P/CF of 40.80. Within the past 12 months, ABM's P/CF has been as high as 19.64 and as low as 6.79, with a median of 12.05.

These are only a few of the key metrics included in ABM Industries'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, ABM looks like an impressive value stock at the moment.

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