Here are three stocks with buy ranks and strong growth characteristics for investors to consider today May 7th:Powell Industries (POWL) : This metal-working shop which support the petrochemical facilities, carries a Zacks Rank #1 (Strong Buy), and has witnessed the Zacks Consensus Estimate for its current year earnings increasing 19.9% over the last 60 days.Powell Industries has a PEG ratio of 1.28 compared with 1.53 for the industry. The company possesses a Growth Score of A.AZZ (AZZ) : This company which ...