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YSI

1725 Brannum Lane
Yellow Springs, Ohio
45387-1107 USA
+1 937-767-7241

Certificate of Analysis

Product Information

Product Category	ISE Reagent
Product Model Number	2970 (10 mg/L Ammonium, 10 mg/L Potassium)
Lot Number	25C100552
Method	Comparative ISE testing of Production reagent vs. Metrology reagent

Testing Results

Chemistry Tested	Determination	Tolerance
Ammonium	(Average of Production) – (Average of Metrology)	≤ 0.2 mg/L (2%)
Ammonium	Coefficient of Variation (CV) for Production reagent	≤ 5%
Potassium	(Average of Production) – (Average of Metrology)	≤ 0.3 mg/L (3%)
Potassium	Coefficient of Variation (CV) for Production reagent	≤ 5%

The procedures used to manufacture and test this product have been verified by QA for GMP compliance.

Technician: Amanda FennerDate: 7/30/2025

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