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Pro Series is the most advanced meter to help you excel at your professional pH analysis. Be reassured, measurements have never been so accurate with German technology, including wider ranges, auto cal and 5-point calibrations. Feel confident with data transfer, data storage and ElectCheck features that meet all your GLP regulatory requirements. Pro Series offers multi-parameter analysis in the PR-50. Go pro and get the whole package: quality, multi-functionality, documentation & convenience – a true professional at work for you.