This week, 4 Electrical Equipment stocks are worse, according to the Portfolio Graderdatabase. Each of these rates a “D” (“sell”) or “F” overall (“strong sell”).

AMETEK, Inc. (AME) gets weaker ratings this week as last week’s D drops to a F. AMETEK, Inc. is a global company that makes electronic instruments and electromechanical devices. For more information, get Portfolio Grader’s complete analysis of AME stock.

This week, Real Goods Solar, Inc. Class A’s (RGSE) rating worsens to a F from the company’s D rating a week ago. The company also gets F’s in sales growth, earnings growth, earnings momentum, and free cash flow. For more information, get Portfolio Grader’s complete analysis of RGSE stock.

Hydrogenics Corporation (HYGS) earns a F this week, moving down from last week’s grade of D. Hydrogenics Corporation designs, develops, and manufactures industrial grade proton-exchange membrane fuel cell automated test stations. The company also gets F’s in earnings revisions, earnings surprise, return on equity, and free cash flow. For more information, get Portfolio Grader’s complete analysis of HYGS stock.

Ultralife Corporation (ULBI) declines this week from a C to a D. Ultralife Corporation is a battery, energy and communication product company that serves government, defense and commercial customers. The company also gets F’s in earnings momentum. For more information, get Portfolio Grader’s complete analysis of ULBI 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.