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.

Bio-Rad Laboratories, Inc. Class A (BIO) boosts its rating from a C to a B this week. Bio-Rad Laboratories, Inc. Class A manufactures and supplies the life science research, healthcare, analytical chemistry and other markets with products and systems used to separate complex chemical and biological materials and to identify, analyze, and purify their components. The company also gets A’s in operating margin growth and earnings surprise. For more information, get Portfolio Grader’s complete analysis of BIO stock.

Charles River Laboratories International, Inc.’s (CRL) ratings are looking better this week, moving up to a B from last week’s C. Charles River Laboratories International, Inc. is a global provider of services to accelerate the drug discovery and development process. The company also gets A’s in earnings revisions and return on equity. For more information, get Portfolio Grader’s complete analysis of CRL stock.

Quintiles Transnational Holdings, Inc. (Q) gets a higher grade this week, advancing from a C last week to a B. The company also gets A’s in free cash flow. For more information, get Portfolio Grader’s complete analysis of Q 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.