Vernier sells three different categories of pH sensor depending on the type of pH electrode used: standard, tris-compatible flat pH, and glass-body pH. Use the images to determine which sensor you have.
Note: The dates indicate the approximate time frame when these sensors were sold.
Standard pH Sensors

Go Direct® pH Sensor (GDX-PH)—current version
- This sensor was first sold in 2017 and is currently shipping.
- Sensor connects via USB or Bluetooth. No interface is required.
- Replacement electrode: Go Direct® pH BNC Electrode (GDX-PH-BNC)
- Go Direct pH Sensor Troubleshooting and FAQs
- Sensor User Manual

Go Wireless pH—sold from 2015 to 2017
- This sensor was sold from 2015 to 2017 and was replaced by the Go Direct pH sensor.
- Sensor connects via Bluetooth only and only to phones and tablets. No interface is required.
- Replacement electrode: Go Direct® pH BNC Electrode (GDX-PH-BNC)
- Go Wireless pH Troubleshooting and FAQs
- Sensor User Manual

pH Sensor (PH-BTA)—current version
- This sensor was first sold in 2012 and is currently shipping.
- This sensor requires an interface (e.g., Go!Link or LabQuest Mini).
- Replacement electrode: None (sensor must be replaced)
- pH Sensor Troubleshooting and FAQs
- Sensor User Manual

PH-BTA—sold from 2006 to 2012
- This sensor was sold between 2006 and 2012.
- This sensor requires an interface (e.g., Go!Link or LabQuest Mini).
- Replacement electrode: None (sensor must be replaced)
- pH Sensor Troubleshooting and FAQs
- Sensor User Manual

PH-BTA—sold from 2002 to 2006
- This sensor was sold between 2002 and 2006.
- This sensor requires an interface (e.g., Go!Link or LabQuest Mini).
- Replacement electrode: None (sensor must be replaced)
- pH Sensor Troubleshooting and FAQs
- Sensor User Manual

PH-DIN—sold prior to 2002
- This sensor was sold until 2002.
- This sensor requires an interface (e.g., Go!Link or LabQuest Mini).
- This sensor requires a DIN to BTA adapter to connect to an interface.
- This sensor does not auto-ID and cannot be used with Graphical Analysis.
- Replacement electrode: pH Electrode BNC (PH-BNC)
- Sensor User Manual
Tris-Compatible Flat pH Sensors

Go Direct® Tris-Compatible Flat pH (GDX-FPH)—current version
- This sensor was first sold in 2017 and is currently shipping.
- Sensor connects via USB or Bluetooth. No interface is required.
- Replacement electrode: Go Direct® Flat pH BNC Electrode (GDX-FPH-BNC)
- Go Direct Tris-Compatible Flat pH Sensor Troubleshooting and FAQs
- Sensor User Manual

Tris-Compatible Flat pH Sensor (FPH-BTA)—current version
- This sensor was first sold in 2010 and is currently shipping.
- This sensor requires an interface (e.g., Go!Link or LabQuest Mini).
- Replacement electrode: Flat pH Electrode BNC (FPH-BNC)
- Tris-Compatible Flat pH Sensor Troubleshooting and FAQs
- Sensor User Manual
Glass-body pH Sensors

Go Direct® Glass-Body pH Sensor (GDX-GPH)—current version
- This sensor was first sold in 2017 and is currently shipping.
- Sensor connects via USB or Bluetooth. No interface is required.
- Replacement electrode: Go Direct® Glass-Body pH BNC Electrode (GDX-GPH-BNC)
- Go Direct Glass-Body pH Sensor Troubleshooting and FAQs
- Sensor User Manual

Glass-Body pH Electrode BNC (GPH-BNC)—current version
- This electrode was first sold in 2015 and is currently shipping.
- An Electrode Amplifier (EA-BTA) and an interface (e.g., Go!Link or LabQuest Mini) are required to use this electrode.
- Replacement electrode: Glass-Body pH Electrode BNC (GPH-BNC)
- Glass-Body pH Electrode BNC: Troubleshooting and FAQs
- Sensor User Manual
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- What is the best way to clean the glass bulb of the pH electrode?
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