YSI DPD Chlorine Total powder pack reagent for colorimetric total-chlorine testing. Choose the sample volume that matches your instrument and expected range, and the pack size (100 or 1000) that matches your test volume.

• 10 mL: 0.02–2.00 mg/L Cl2 on YSI pHotoFlex and 900 (or 0.1–8.0 mg/L using two packs on the 900 only)
• 25 mL: 0.5–5.0 mg/L Cl2, used with pHotoFlex
• 5 mL: 0–3.5 mg/L Cl2, for other manufacturers' instruments only

Each pack contains pre-measured powder reagent for consistent, repeatable DPD colorimetric results.