The O2 Gas Sensor measures oxygen concentration in air, and is temperature compensated for use in different environments. It has a wide measurement range, allowing it to be used to study human and cellular respiration. The O2 Gas Sensor also includes a 250 mL bottle that can be used to study the rusting of iron or as a respiration chamber for monitoring plants and insects. Included are: Vernier Oxygen Gas Sensor 250 mL gas sampling bottle Instruction Manual **This item requires the use of a LabQuest computer interface which is also available for checkout. Click the checkout tab to check this item out.