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 your dissolved oxygen probe.Design Features:Precise formulationFactory mixed using reagent grade chemicals in a dedicated, temperature controlled environment.TraceableProduct labeled with product code, lot number and expiration date.SecureAir tight bottle with tamper-proof seal.Easy drop tip for accurate volume control.Extra tipsWatch for the membrane having wrinkles or stretch marks. If you see wrinkles, replace with a new membrane.Always use fresh electrolyte solution (MA9072S). Thank you for considering Milwaukee to help you take your results to the next level.