Over several months, I collected data using 4 sensors all next to each other and of the same model. After plotting all of the data, three of them yielded nearly identical results, however one of them measured consistently lower (about 5x lower, on average), than the other three. It did follow the same general trend as the other three, except for the fact that it would randomly spike and provide a very large count, then immediately go back to baseline. This happened only about 4 times over the course of several months. The other sensors didn’t do this.
I noticed that the weaker sensor was running on firmware version 4.02, whereas the others were either 7.02 or 7.04. This could be coincidence but it is curious. I was wondering if anyone had any insight on this phenomenon. Thanks.