This week, 3 Machinery stocks are improving their overall ratings on Portfolio Grader. Each of these stocks is rated an “A” (“strong buy”) or “B” overall (“buy”).

Kadant Inc. (KAI) earns a B this week, jumping up from last week’s grade of C. Kadant Inc. is a supplier of equipment used in the global papermaking and paper recycling industries. The company also gets A’s in free cash flow. For more information, get Portfolio Grader’s complete analysis of KAI stock.

Miller Industries, Inc. (MLR) is seeing ratings go up from a B last week to a A this week. Miller Industries, Inc. is a domestic and foreign manufacturer of vehicle towing and recovery equipment. The company also gets A’s in sales growth, operating margin growth, and earnings growth. For more information, get Portfolio Grader’s complete analysis of MLR stock.

Energy Recovery, Inc. (ERII) boosts its rating from a D to a B this week. Energy Recovery, Inc. develops and manufactures energy recovery devices utilized in the water desalination industry. The company also gets A’s in sales growth and earnings surprise. For more information, get Portfolio Grader’s complete analysis of ERII stock.

Louis Navellier’s proprietary Portfolio Grader stock ranking system assesses roughly 5,000 companies every week based on a number of fundamental and quantitative measures. Stocks are given a letter grade based on their results — with A being “strong buy,” and F being “strong sell.” Explore the tool here.