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HI-1271 is the replacement electrode for the HI-98100 checker plus, HI-98103 pocket pH tester, and the HI-98115 Groline pH tester. Replacing the pH electrode is both quick and easy. Simply unscrew the old probe and fit the new one. HI-1271 is a single junction pH electrode with a slim 8mm polypropylene body that easily fits into test tubes and other small-sized vessels.