Here at Zacks, our focus is on the proven Zacks Rank system, which emphasizes earnings estimates and estimate revisions to find great stocks. Nevertheless, we are always paying attention to the latest value, growth, and momentum trends to underscore 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 a variety of methods, including tried-and-true valuation metrics, to find these stocks.

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 stock to keep an eye on is ADT (ADT Quick QuoteADT - Free Report) . ADT is currently sporting a Zacks Rank of #2 (Buy), as well as a Value grade of A. The stock holds a P/E ratio of 10.29, while its industry has an average P/E of 16.57. ADT's Forward P/E has been as high as 25.75 and as low as 7.06, with a median of 10.02, all within 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. ADT has a P/S ratio of 0.88. This compares to its industry's average P/S of 1.98.

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