The shaft of the Optical DO Probe has an outer diameter of 18 mm, which is larger than most of our stick probes. It fits in test tubes with a diameter of 20 mm, the Primary Productivity Kit (PPK), and Water Quality Bottles (8 bottles) (WQ-BOT). It is not compatible with the Electrode Support (ESUP). The widest part of the probe (the handle) is 31 mm.

The Opticial DO Probe can be submerged up to 1 meter for 30 minutes, but is not intended for long-term submersion. The box containing the microSD card, switch, and barometer cannot be submerged.