Windjammer Capital Investors has purchased Advanced Instruments LLC, a maker of medical test equipment, for an undisclosed amount. The deal marks as the sixth investment from the buyer’s $726 million Senior Equity Fund IV.

Advanced Instruments designs and manufacturers laboratory test devices used across the microbiology, pharmaceutical, clinical, food and dairy, and biotech markets. The target touts its ability to measure osmolality with its freezing point depression technology, used to make devices like the A2O Advanced Automated Osmometer. Norwood, Massachusetts-based Advanced Instruments was founded in 1955 and now serves its clients in more than 90 countries under the Advanced Instruments, Fiske and Mart Microbiology brands.

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