The grades of 3 Life Sciences Tools & Services 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.

Thermo Fisher Scientific Inc. (TMO) is seeing ratings go up from a C last week to a B this week. Thermo Fisher Scientific Inc. manufactures and sells products to assist in the pharmaceutical, academic, and other related research and industrial markets. The company also gets A’s in free cash flow. For more information, get Portfolio Grader’s complete analysis of TMO stock.

PAREXEL International Corporation (PRXL) shows solid improvement this week. The company’s rating rises from a C to a B. PAREXEL International Corporation is a contract research and product launch organization. The company also gets A’s in return on equity. For more information, get Portfolio Grader’s complete analysis of PRXL stock.

This week, VirtualScopics, Inc.’s (VSCP) ratings are up from a F last week to a B. VirtualScopics, Inc. is a provider of quantitative imaging for clinical trials serving the pharmaceutical, biotechnology and medical device industries. The company also gets A’s in earnings momentum. For more information, get Portfolio Grader’s complete analysis of VSCP 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.