Good morning, we are students who are carrying out a project on how to measure the environmental conditions of enclosed spaces, and we are using a Raspberry Pi 3 Model B +.
We need a sensor that measures the oxygen concentration in the environment urgently. We have already found a model: ME2-O2. The problem is that this sensor costs around 44 euros and comes from China.
Do you know of pages where we can find similar models and much more affordable? Do you know of models that have the same features as this sensor?