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The HI747-25 are the replacement reagents for the HI747 Copper Low Range Checker® HC.

The HI4007 chloride ion selective electrode is a potentiometric half-cell sensor

The HI4108 cupric ion selective electrode is a complete potentiometric cell

HI719-25 Magnesium Hardness Reagents, 25 Tests for the HI719 Checker Magnesium Hardness Photometer.
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