Chlorine SpecCheck Secondary Standards Kit for Mid Range DPD Chlorine Methods. Contains a blank vial and 3 colored vials at ~0.2, ~1.5, and ~3.5 mg/L Cl2. SpecCheck Standards are computer-formulated and have a two-year shelf life from date of manufacture. For use only with Mid Range DPD chlorine methods. Not for use with Low Range methods (including LR/HR Pocket Colorimeter II).

• Solid gel standards
• No preparation required
• Ideal for insturment verification in the lab and in the field
• NIST traceable

Ready-to-use SpecCheck Secondary Standards Kits include four 10 ml (1") sealed glass cells with a blank and three different standards within the typical testing range, instructions, plastic case and Certificate of Analysis.