The Apera Instruments DO503 is a replacement membrane cap set designed specifically for use with the DO500 polarographic dissolved oxygen electrode.

These easy-to-replace caps ensure your DO500 sensor maintains optimal performance and accuracy during dissolved oxygen measurements in laboratories, aquaculture, environmental monitoring, and other applications.

Key Features:

✔ Compatible with DO500 Electrode – Specifically designed for a perfect fit
✔ Reliable Replacement – Maintains sensor performance and accuracy
✔ Simple Installation – Quick and easy to replace when needed
✔ Durable Material – Ensures consistent and long-lasting measurements

Package Includes:

✔ 3 x DO503 Membrane Caps