• For use with 0-8 and 0-10 mg/L HR DPD Chlorine methods
• Use with Hach Colorimeters and Spectrophotometers
• Solid Gel Standard - No preparation required
• Ideal for instrument verification in the lab and in the field
• 2-year guaranteed performance

Ready-to-use SpecCheck Secondary Standards Kits include four 10-mL (1-inch) sealed glass cells with a blank and three different standards within the typical testing range, instructions, plastic case and Certificate of Analysis. SpecCheck Standards are computer-formulated and have a two-year shelf life from date of manufacture.