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🧪 Elevate your chlorine testing game with lab-grade precision you can trust!
The Hach SpecCheck Secondary Gel Standards Set offers four ready-to-use, sealed gel vials that simulate chlorine test colors across 0-6.5 mg/L Cl₂ range. Designed for consistent instrument calibration, these computer-formulated standards provide lab-grade accuracy with a 2-year shelf life, all in a compact, non-hazardous kit complete with a Certificate of Analysis.






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