Ultra Sound wireless LP tank sensor , Bluetooth to phone app

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.

I've been using a pair of the Mopeka sensors for a few months so far and have been quite satisfied with the performance. The key to consistent readings seems to be making sure there's a solid contact with the cylinder bottom by putting a dab of dielectric grease or petroleum gel (Vaseline) on the sensor pad before attaching it. Both of my sensors came with a small tube of grease for that purpose. The sensors come with a set of small aluminum spacers to hold the cylinder high enough off the ground to clear the thin sensor unit, but I found their optional "halo" spacer to be much easier to use.

I tried it when it first came out a couple years ago, and it didn't work reliably for me. Sometimes no signal, levels changed, just didn't trust the accuracy. Perhaps they've improved them.

Like everything there are positives and negatives.

On the plus side as long as it is located properly on the bottom of the tank it gives you a very good reading of the propane in the tank.

On the negative side the battery life is not very good. If you are full time and having to refill often then just remember to change the battery every 6 or 8 months and you will be good. I am not full time and use very little propane so the battery life is shorter than the time it takes me to use the cylinder of propane. I have rectified this problem by making a remote battery system that uses AA batteries mounted where they can be changed without removing the cylinder.

The sensor is thick enough that the tank has to be elevated slightly to prevent crushing it. They provide feet to do this but I am not impressed with them and made my own.

I also had one of the sensors lost the contact pad when I took it to be filled. Mopeka tells me it is not repairable but I will have to replace it as it is long past warranty.

Looks interesting, I wonder how well it will hold up to the spray and grime from the road when on the bottom of the tanks on mh's. And how much they cost?