Sometimes two sensors measuring in the same place at the same time don’t give the exact same readings. There a number of possible reasons for this:
- It could be due to something your students are doing (for example, covering the air inlet or exhaust)
- One sensor might be dirty or damaged
- It can also be due to how the sensors were built
It’s a good idea to operate the sensors together for a while to learn how the readings compare before separating them to measure in two different places. This presents a great opportunity for your students to collaboratively read and compare sensor measurements.