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.Considering these trends, value investing is clearly one of the most preferred ways to find strong stocks in any type of 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.Zacks has developed the innovative Style Scores system to highlight stocks with specific traits. For example, value investors will be interested in stocks with great grades in the "Value" category. When paired with a high Zacks Rank, "A" grades in the Value category are among the strongest value stocks on the market today.One stock to keep an eye on is Altra Industrial Motion (AIMC). AIMC is currently sporting a Zacks Rank of #1 (Strong Buy), as well as an A grade for Value. The stock has a Forward P/E ratio of 11.50. This compares to its industry's average Forward P/E of 16.93. Over the past year, AIMC's Forward P/E has been as high as 24.54 and as low as 11.50, with a median of 17.85.Another notable valuation metric for AIMC is its P/B ratio of 2.64. The P/B is a method of comparing a stock's market value to its book value, which is defined as total assets minus total liabilities. This company's current P/B looks solid when compared to its industry's average P/B of 4.71. Over the past 12 months, AIMC's P/B has been as high as 3.94 and as low as 2.64, with a median of 3.20.Finally, we should also recognize that AIMC has a P/CF ratio of 11.81. This data point considers a firm's operating cash flow and is frequently used to find companies that are undervalued when considering their solid cash outlook. AIMC's current P/CF looks attractive when compared to its industry's average P/CF of 15.30. Over the past year, AIMC's P/CF has been as high as 18.61 and as low as 11.81, with a median of 14.76.These figures are just a handful of the metrics value investors tend to look at, but they help show that Altra Industrial Motion is likely being undervalued right now. Considering this, as well as the strength of its earnings outlook, AIMC feels like a great value stock at the moment.Want the latest recommendations from Zacks Investment Research? Today, you can download 7 Best Stocks for the Next 30 Days. Click to get this free report Altra Industrial Motion Corp. (AIMC): Free Stock Analysis Report To read this article on Zacks.com click here. Zacks Investment Research