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{tag=Work by Hanna Instruments}

By <Hanna Instruments>.

Publisher: Hanna Instruments.

Online text: https://www.nist.gov/document/hanna-5221-ph-meter-manual

Cited passages: Hanna Instruments, HI5221 & HI5222 instruction manual, pp. 45–47, 49–50 and 73–74: calibration, measurement, rinsing and electrode conditioning.


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