The proven Zacks Rank system focuses on earnings estimates and estimate revisions to find winning stocks. Nevertheless, we know that our readers all have their own perspectives, so we are always looking at the latest trends in value, growth, and momentum to find strong picks.Considering these trends, value investing is clearly one of the most preferred ways to find strong stocks in any type of market. Value investors use tried-and-true metrics and fundamental analysis to find companies that they believe are undervalued at their current share price levels.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 South Plains Financial, Inc. (SPFI). SPFI is currently sporting a Zacks Rank of #2 (Buy) and an A for Value. The stock has a Forward P/E ratio of 9.34. This compares to its industry's average Forward P/E of 11.01. SPFI's Forward P/E has been as high as 14.38 and as low as 6.81, with a median of 10.26, all within the past year.Investors should also recognize that SPFI has a P/B ratio of 0.78. 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 stock's P/B looks attractive against its industry's average P/B of 0.91. SPFI's P/B has been as high as 1.28 and as low as 0.65, with a median of 0.97, over the past year.Value investors also use the P/S ratio. The P/S ratio is is calculated as price divided by sales. Some people prefer this metric because sales are harder to manipulate on an income statement. This means it could be a truer performance indicator. SPFI has a P/S ratio of 1.22. This compares to its industry's average P/S of 1.85.Finally, investors should note that SPFI has a P/CF ratio of 6.67. 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. This stock's P/CF looks attractive against its industry's average P/CF of 11. Over the past year, SPFI's P/CF has been as high as 13.08 and as low as 5.68, with a median of 10.02.These are only a few of the key metrics included in South Plains Financial, Inc.'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, SPFI looks like an impressive 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 South Plains Financial, Inc. (SPFI): Free Stock Analysis Report To read this article on Zacks.com click here.