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.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 tried-and-true metrics and fundamental analysis to find companies that they believe are undervalued at their current share price levels.On top of the Zacks Rank, investors can also look at our innovative Style Scores system to find stocks with specific traits. For example, value investors will want to focus on the "Value" category. Stocks with high Zacks Ranks and "A" grades for Value will be some of the highest-quality value stocks on the market today.Greenland Technologies (GTEC) is a stock many investors are watching right now. GTEC is currently sporting a Zacks Rank of #2 (Buy) and an A for Value. The stock is trading with a P/E ratio of 4.86, which compares to its industry's average of 14.38. Over the last 12 months, GTEC's Forward P/E has been as high as 16.83 and as low as 4.09, with a median of 7.52.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. GTEC has a P/S ratio of 0.44. This compares to its industry's average P/S of 0.89.Finally, investors should note that GTEC has a P/CF ratio of 5.82. 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. GTEC's current P/CF looks attractive when compared to its industry's average P/CF of 10.47. Within the past 12 months, GTEC's P/CF has been as high as 9.84 and as low as 3.70, with a median of 5.82.Value investors will likely look at more than just these metrics, but the above data helps show that Greenland Technologies is likely undervalued currently. And when considering the strength of its earnings outlook, GTEC sticks out at as one of the market's strongest value stocks. Zacks' Top Picks to Cash in on Electric Vehicles Big money has already been made in the Electric Vehicle (EV) industry. But, the EV revolution has not hit full throttle yet. There is a lot of money to be made as the next push for future technologies ramps up. Zacks’ Special Report reveals 5 picks investorsSee 5 EV Stocks With Extreme Upside Potential >>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 Greenland Technologies Holding Corporation (GTEC): Free Stock Analysis Report To read this article on Zacks.com click here. Zacks Investment Research