Milwaukee MA9072S Oxygen Electrolyte Solution The MA9072S electrolyte fill solution is designed for Milwaukee's MA860 Galvanic Dissolved Oxygen probe and MA861 Dissolved Oxygen membranes. A high-quality electrolyte solution is crucial to the performance of a dissolved oxygen probe. The solutions are factory mixed using reagent-grade chemicals in a dedicated, temperature-controlled environment. It is sealed with an air-tight bottle with a tamper-proof seal. There is a product code, expiration date, and lot number for traceability. The bottle has an easy drop tip for accurate volume control. Specifications: Package: Bottle Size: 30 mL Quantity: 1 Certificate of Analysis: No CARE AND USE TIPS Watch for the membrane having wrinkles or stretch marks. If you see wrinkles, replace with a new membrane. Always use fresh electrolyte solution (MA9072S).