Check the listing for details. Vernier Dissolved Oxygen (O2) Probe DO-BTA Lab Data Collection Sensor. Condition: Used. Listed at 24.99 USD. Vernier Dissolved Oxygen Probe DO-BTA Lab Data Collection Sensor The Dissolved Oxygen Probe is great for biology, chemistry, ecology, or integrated science courses. It can be used to perform a wide variety of experiments to determine changes in dissolved oxygen levels, one of the primary indicators of the quality of an aquatic environment.Built-in temperature compensation lets you calibrate in the lab, then make measurements outdoors without having to recalibrate.Disposable caps with pre-fit membranes allow you to quickly and conveniently change membranes.Calibrate in the units you choose: % dissolved oxygen, mg/L, or ppm dissolved oxygenSpecificationsRange: 0 to 15 mg/L (or ppm)Accuracy: ±0.2 mg/LResponse Time: 95% of final reading in 30 seconds, 98% in 45 secondsTypical Resolution: 0.014 mg/LTemperature Compensation: automatic from 5–35°CPressure Compensation: manualSalinity Compensation: manualMinimum sample flow: 20 cm/secondSee the pictures for detail and condition. Pictures of actual items. Items come from a smoke free and pet free home. Check out my other eBay listings! (Comics, board games, video games, books, and more!) I am happy to combine items for reduced shipping costs.