The MA9071 electrolyte fill solution is designed for Milwaukee's polarographic dissolved oxygen probe. A high quality electrolyte solution is crucial to the performance of your dissolved oxygen probe.DESIGN FEATURESPRECISE 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.USE AND CARE“OPEN AIR” CALIBRATION PROCEDURE FOR THE MW600 DISSOLVED OXYGEN METER1. Remove the membraneTake the membrane off the end of the probe and dry the diode off.2. Zero out the displayConnect the probe to the base unit and turn the unit on. Your display should read 0.0. If it does not, go to the position “0” screw on the front of the unit with the screw driver provided and through the access hole make the unit display read 0.0.3. Fill the membraneGo to the membrane and put the “O” ring inside the membrane on the shoulder at the base of the threads. Fill the membrane to just short of the “O” ring with MA9071 electrolyte solution. Be sure that there are no bubbles inside the membrane. (Air bubbles are the main cause of calibration failure)4. Attach the membraneScrew the membrane on to the probe.5. Let stablizeTurn the meter on and hang the probe off the end of a table pointing down and let the unit display stabilize (this may take 5 to 15 minutes)6. AdjustPush down and hold the “Cal” button on the front face of the meter and with the screwdriver go to the front Cal position “100%” and make the display read 100.You are now calibrated.EXTRA TIPSWatch for the membrane having wrinkles or stretch marks. If you see wrinkles, replace with a new membrane.Always use fresh electrolyte solution (MA9071).