The whole set contains 5PCS D.O. membrane blocks and 2 bottles of electrolyte solution, each bottle of electrolyte solution is 15mL.
The membrane set and electrolyte solution is only for AZ-86021 and AZ-86031 Combo Water Quality Tester & AZ-8413 Dissolved Oxygen Pen. NOT for other models.
Description
D.O. Membrane Set & Electrolyte Solution Dissolved Oxygen Membrane Block 5PCS & Electrolyte Solution 15mL*2 for AZ-86021 AZ-86031 Combo Water Quality Tester & AZ-8413 Dissolved Oxygen Pen