Product review (2 stars): Accuracy and Quality in question.
Purchased and started using unit in April of 2017.
Have 2 issues with this product: Accuracy and Quality.

I question the accuracy of the units since they all had different readings right at the edge of the quoted specification limits.  Mathematically the results should fall into a Gaussian distribution with the limits representing either 3 or 6 stander deviations.  This implies they are "binning" the remote modules where they save the best units for certain systems and the rest get used by the lower end units.
There are adjustments available to tweak the values, so I used those and lived with the questionable accuracy.

As for quality, within 1 year of use, both of the remote LCD display units failed.  Just plain dead.  Fresh batteries, reset, nothing but dead units.  One was located in a bedroom, the other in the basement.

For the year of use, the whole system worked pretty nice.  But my system is only 1/2 working now and the product wasn't worth the money.