I have been using them as well. Great Idea, but I've found them to be pretty finicky. Proper placement is critical along with using some dielectric grease on the contact patch, So far on the trailer they have been reasonably reliable, along with the remote readout they offer. The newest remote display can be calibrated for 30lb tanks.
I've had less luck with them on portable 20 and 5 lb tanks for the grill and firepit and heater. I guess moving the tanks around can misadjust the sensor position.
Also they are sensitive to water not waterproof.
