Wireless Air Oximeter sensor Redy

Quick Answer: The Redy wireless air oximeter sensor is an oxygen gas sensor that measures the percentage of oxygen in air or inside a sealed chamber and logs it wirelessly over time. It is a laboratory gas sensor for experiments, not a pulse oximeter for blood oxygen.

Measuring Oxygen in the Gas Phase

Dry air is roughly one-fifth oxygen. Put germinating seeds, woodlice or a lit candle in a sealed jar with this sensor, and the log shows that fraction falling as oxygen is used; put a leafy shoot in the jar under a lamp, and it can rise instead. Because the reading is continuous, students see the rate of change, not just a before-and-after pair.

The name includes oximeter, but the title specifies air: the sensor is intended for gases, not for water. For dissolved oxygen as well as air, the optical air and water oximeter sensor is the related model. The title does not give the sensing principle; many classroom oxygen gas sensors use an electrochemical cell, which has a limited working life and responds to changes in air pressure as well as oxygen content.

Exhaled breath makes an easy first investigation: compare room air with breath collected in a bag, and the drop in oxygen is obvious.

Applications

• Oxygen uptake by germinating seeds or small invertebrates in a closed chamber
• Oxygen released by plants in light and taken up again in the dark
• Oxygen depletion as a candle burns in a sealed jar
• Comparing oxygen in inhaled and exhaled air

Specifications

Care & Handling

• Keep the sensor opening dry; condensation from breath or respiring organisms can upset readings.
• Calibrate in fresh outdoor or well-ventilated room air before experiments.
• Keep flames well away from the sensor body in combustion demonstrations.
• Store it in clean air, away from solvent vapours.

Why Choose LabEquip

Biology teachers running respiration and photosynthesis practicals in sealed chambers buy this type of sensor, as do chemistry teachers demonstrating combustion. LabEquip includes it in its chemistry lab equipment; chamber and range questions are answered through the contact page.

Frequently Asked Questions

Can this sensor measure blood oxygen?

No. It is designed to measure oxygen in air and gas samples during experiments. Blood oxygen saturation is measured with a medical pulse oximeter, and this sensor must not be used for any health assessment.

What reading should normal room air give?

Close to 21 percent oxygen for dry air, slightly less in very humid air. Calibration in fresh air is normally set to this value.

Can the air oximeter be used in water?

No. The title specifies air, and immersing a gas sensor can damage it. Use a dissolved oxygen sensor for aquatic experiments.

Why does the oxygen reading fall slowly in a respiration chamber?

Small organisms use oxygen slowly compared with the volume of air around them. Use a smaller chamber, more seeds or a longer run to see a clearer change.

Does temperature affect the readings?

Yes. Gas volume and sensor response both change with temperature, so keep the chamber at a steady temperature and shield it from the heat of the lamp, for example with a water screen.

Does the oxygen sensor wear out?

If it uses an electrochemical cell, as many oxygen gas sensors do, the cell is slowly consumed and has a limited working life. A slow response or failed calibration are signs that it is ageing.

Last Updated: September 2026