Vernier Optical DO Probe (ODO-BTA)
Specifications and User Guide

Primary Test: Connect the Vernier Optical DO Probe to the data-collection interface. Start the data-collection software. Make sure you are using a current version of the software. The software will auto-ID the sensor.

Secondary Test: Verify the sensor reads 100% in air-saturated water or water-saturated air.

Note: The Optical DO Probe is not compatible with the Go!Link (GO-LINK).


What is the difference between a regular Dissolved Oxygen Probe and the Optical DO Probe? Which one should I buy?
What are the dimensions of the Optical DO Probe?
What sensors are not compatible with Go!Link?
Can the Optical DO Probe measure oxygen gas?
Are there any interfering gases when using the Optical DO Probe?
Can I upgrade my Optical DO Probe?
How do I know if my Optical DO Probe can measure 0-100% or 0-300%?
I am having problems with the Vernier Optical DO Probe (ODO-BTA). The DO level goes up past 13 mg/L and then drops to 0.8 mg/L or less.
How do I compensate for salinity when measuring dissolved oxygen?

Can I perform a two-point calibration for the Optical DO Probe?
How do I create a zero-oxygen calibration solution for the Optical DO Probe?
Can DO values be corrected for salinity after the fact by applying salinity correction factors?
How do I reset the calibration on the Optical DO Probe?
Why is my Optical DO Probe reading a negative value?

Can I use the Optical DO Probe with other water quality sensors?
Can I use Vernier water quality sensors in salt water or in a salt water aquarium?
How do I change units when using the Optical DO Probe?
Why is my Optical DO Probe reading a negative value?

Can the optical DO probes be substituted for experiments using the Dissolved Oxygen Probe?

When does the Optical DO Probe cap need to be replaced?
What do I do if my Optical DO storage cap is broken?
What is the difference between the white storage bottle in the Optical DO Probe video and the clear bottle I received?
How do I disinfect an Optical DO Probe?

-Order code: ODO-BTA
-Range: 0 to 20 mg/L
0 to 300 %
-Accuracy: +/- 0.2 mg/L below 10 mg/L
+/- 0.4 mg/L above 10 mg/L
+/- 2 % below 100%
+/- 5 % above 100%
-Accuracy with calibration reset: +/- 0.1 mg/L below 10 mg/L
+/- 0.2 mg/L above 10 mg/L
+/- 1 % below 100%
+/- 5 % above 100%
-Resolution, 12-bit (LabQuest – any model, LabPro) 0.006 mg/L
-Response time: 90% of final reading in 40 seconds
-Temperature compensation: automatic from 0 to 50℃
-Pressure compensation: automatic from 30.4 kPa to 202.6 kPa (228 mmHg to 1519 mmHg)
-Salinity compensation: manual, accounted for during calibration
-Minimum sample flow: none

-Calibrate? No. The Optical DO Probe and sensor cap are factory calibrated and a calibration code specific to each individual cap is determined during the manufacturing process. The sensor is set to the stored calibration before shipping. If you wish to calibrate the sensor, you will conduct a one-point calibration using the saturated DO value. Refer to the user manual for detailed instructions.

Optical DO Probe Replacement Cap (ODO-CAP)
Optical DO Probe Metal Guard (ODO-GRD)
Primary Productivity Kit (PPK)
Dissolved Oxygen Probe (DO-BTA)