Here at Zacks, we focus on our proven ranking system, which places an emphasis on earnings estimates and estimate revisions, to find winning stocks. But we also understand that investors develop their own strategies, so we are constantly looking at the latest trends in value, growth, and momentum to find strong companies for our readers.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 use fundamental analysis and traditional valuation metrics to find stocks that they believe are being undervalued by the market at large.In addition to the Zacks Rank, investors looking for stocks with specific traits can utilize our Style Scores system. Of course, value investors will be most interested in the system's "Value" category. Stocks with "A" grades for Value and high Zacks Ranks are among the best value stocks available at any given moment.One stock to keep an eye on is Polaris Inc (PII). PII is currently sporting a Zacks Rank of #2 (Buy) and an A for Value. The stock has a Forward P/E ratio of 13.16. This compares to its industry's average Forward P/E of 36.37. PII's Forward P/E has been as high as 21.87 and as low as 11.66, with a median of 13.85, all within the past year.Another valuation metric that we should highlight is PII's P/B ratio of 7.39. The P/B ratio pits a stock's market value against its book value, which is defined as total assets minus total liabilities. PII's current P/B looks attractive when compared to its industry's average P/B of 7.45. PII's P/B has been as high as 8.76 and as low as 5.14, with a median of 7.31, over the past year.Value investors also frequently use the P/S ratio. This metric is found by dividing a stock's price with the company's revenue. This is a popular metric because sales are harder to manipulate on an income statement, so they are often considered a better performance indicator. PII has a P/S ratio of 1.09. This compares to its industry's average P/S of 1.61.Finally, investors should note that PII has a P/CF ratio of 9.01. 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. This company's current P/CF looks solid when compared to its industry's average P/CF of 22.97. PII's P/CF has been as high as 11.59 and as low as 7.86, with a median of 9.61, all within the past year.These figures are just a handful of the metrics value investors tend to look at, but they help show that Polaris Inc is likely being undervalued right now. Considering this, as well as the strength of its earnings outlook, PII feels like a great value stock at the moment. Breakout Biotech Stocks with Triple-Digit Profit Potential The biotech sector is projected to surge beyond $775 billion by 2024 as scientists develop treatments for thousands of diseases. They’re also finding ways to edit the human genome to literally erase our vulnerability to these diseases. Zacks has just released Century of Biology: 7 Biotech Stocks to Buy Right Now to help investors profit from 7 stocks poised for outperformance. Our recent biotech recommendations have produced gains of +50%, +83% and +164% in as little as 2 months. The stocks in this report could perform even better.See these 7 breakthrough stocks now>>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 Polaris Inc. (PII): Free Stock Analysis Report To read this article on Zacks.com click here. Zacks Investment Research