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.

Specifications:
Warm-Up time: Less than 5 seconds to 90% of final value
Pressure effect: Directly proportional, Vout = Vout (standard) x (P/1013)
Pressure range: 0.5 atm to 1.5 atm
Output signal range: 0 to 4.8 VDC; 2.7 to 3.8 VDC @ 21% O₂
Output impedance: 1 KΩ
Input voltage: 5 VDC +/–0.25 VDC
Gas sampling mode: Diffusion
Normal operating temperature range: 25 °C (±5 °C)
Operating temperature range: 5 to 40 °C (with calibration)
Operating humidity range: 0 to 95% RH
Storage temperature range: –20 to +60 °C
Sensor tube dimensions: 45 mm length, 28 mm OD; total length: 120 mm