I personally have not used them, but thought I would comment on the waste tank sensors which most motor homes have as we all PC owners also have.
People with all brands of RVs say their waste tank sensors don't hold up over the years. With mine, so far, so good after 3.5 years. I wonder if I'll be okay for a long time because of the way I prep my RV for winter.
I store our motor home in our heated garage which happens to be under our master bedroom. We sleep all year long, about 3 feet away from our PC waste tank vent with a house floor in between. In an effort to eliminate any "potential" for RV sewer gas, at the end of every RV season, I pour one bottle of bleach down the RV drains & toilet, let sit an hour in the traps, then continue to fill up the waste tanks through the sinks, shower, and toilet until both tanks are full. I also run the mascerator pump briefly to get the diluted bleach solution in that system. Then I let it all sit around a half day, then drain both tanks into the ditch next to the driveway. This thoroughly cleans the tanks and mascerator system, elimiates sewer gas odor, and "I Hope" cleans off the waste tank sensors.
BTW: The bleach also does a very nice job of cleaning the toilet bowl and trap door there. I fill the toilet bowl to near top with water and a little bleach, and let that soak too.