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Windjammer Capital Investors in Newport Beach acquired on undisclosed terms Advanced Instruments, LLC in Norwood, Mass.

Advanced Instruments is a 61-year-old company that makes laboratory test equipment used in clinical, food, pharmaceutical and biotech markets in some 90 countries.

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Windjammer invests $50 million to $200 million in middle market firms—those with up to $50 million in earnings before interest, taxes, depreciation and amortization. This is the sixth acquisition in its $726 million Senior Equity Fund IV.

The investor is one of Orange County’s long-standing private equity firms. It started in the 1990s as part of Newport Beach-based Pacific Life Insurance Co. and has invested some $1.5 billion in more than 50 companies.