YSI COD, LR, Hg-Free Vial Reagent, 25-Pack eDNA The built-in four-electrode conductivity cell

The built-in four-electrode conductivity cell automatically compensates for salinity in DO calculations — eliminating manual correction and improving accuracy in brackish or variable-salinity environments

or telemetry unit

Current part number — replaces the older YAP173

drifting or non-calibrating pH reading is frequently the reference tip rather than the pH element itself

2-wire 4–20 mA analog output plus RS-485 digital output

YSI COD, LR, Hg-Free Vial Reagent, 25-Pack eDNA The built-in four-electrode conductivity cellCOD, LR (low range), Hg free vial reagent, pack of 25. Requires a thermal reactor for digestion. Used in the YSI 910 only. Range: 0 150 mg L