Go Direct^® Electrode Amplifier (GDX-EA)
Specifications and User Guide

TROUBLESHOOTING
-Primary Test: Connect an electrode (such as an ORP, pH or ISE) to the Electrode Amplifier and connect the Electrode Amplifier to your platform. Start the data-collection program. Place the electrode in a standard solution of known value and confirm that the readings are within range.
-Secondary Test: Confirm that the BNC connection is secure.

RELATED TIL ENTRIES
Can I use my third-party ISE with my Vernier equipment?
How do I change the displayed measurement channel on my Go Direct Electrode Amplifier or ISE Amplifier?
What is the difference between the Go Direct Electrode Amplifier (GDX-EA) and the Go Direct ISE Amplifier (GDX-ISEA)?

CALIBRATION
-Calibrate? It depends on the electrode that is connected. If you have an electrode connected to read Voltage, calibration is disabled. If you have an electrode connected to read pH, you may perform a two point or three point calibration in Graphical Analysis 4 software.
See How do I calibrate my sensor?

RELATED VERNIER PRODUCTS
https://www.vernier.com/products/accessories/bnc-electrodes/