The grades of 3 Machinery stocks are better this week, according to the Portfolio Grader database. Every one of these stocks has an “A” (“strong buy”) or “B” overall (“buy”) rating.

ESCO Technologies Inc. (ESE) earns a B this week, jumping up from last week’s grade of C. ESCO Technologies Inc. is a producer of engineered products and systems, primarily for utility, industrial, aerospace and commercial applications. For more information, get Portfolio Grader’s complete analysis of ESE stock.

Lydall, Inc.’s (LDL) ratings are looking better this week, moving up to a A from last week’s B. Lydall, Inc. develops and manufactures engineered materials for a variety of applications. The company also gets A’s in operating margin growth, earnings growth, earnings revisions, and free cash flow. For more information, get Portfolio Grader’s complete analysis of LDL stock.

Douglas Dynamics, Inc. (PLOW) is seeing ratings go up from a C last week to a B this week. Douglas Dynamics, Inc. designs, makes, and sells snow and ice control equipment for light trucks. The company also gets A’s in sales growth, earnings growth, earnings revisions, and return on equity. For more information, get Portfolio Grader’s complete analysis of PLOW 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.