Mopeka Pro Check Universal Sensor - Bluetooth Ultrasonic Sensor for Steel Propane Tanks - Perfect for Propane Grills, Water Tanks & Campers - Water Level SensorUp to 250 Gallon Tanks

How much propane is left in my tank(s)?These gages were easy to install on our tanks and easy to connect to my iPhone. It's wonderful to know how much actual propane is in the RV tanks before heading out camping. No more taking off the tank cover, unclamping the tank hold down, lifting and shaking the tanks and then trying to guess if its time to fill them or not.I initially bought two for our 30 lb RV tanks, and like them so well that I just bought two more, one for the 20 lb propane BBQ tank and one for the 20 lb propane fire bowl tank. The same gages work for multiple tank sizes, so you can easily move them from one tank size to another.Some reviews complained about battery life so I've set mine to the longest interval between automatic inquiries, and I turn off the app on my iPhone except when I'm checking tank levels, hoping that will stop the communication attempts from the tanks and make the batteries last longer. Haven't had them long enough to experience any battery issues.

Easy setup. Just works. Downloaded the app, pushed the sync button—paired. Did that 4 times for 4 sensors. No issues over the last six months of use. Want personalization? You can setup each tank sensor with names, how often it updates, manually specify tank size, and more.I also purchased the Mopeka Gauge display and Bluetooth/WiFi Bridge. I don’t have to use my phone with the Gauge but it’s a simple push/button check. Personally, I find myself using my phone mostly, which is where the Bridge has worked flawlessly for checking remotely (not at home within Bluetooth range). Full-Time RVers: get this system.I had a tank on the ground during freezing/thawing weather. Water got into a sensor and broke it. I ordered one of the newer sensors that does more than just propane. It took me 5 seconds to pair the new sensor and 30 more seconds to name, specify tank size, read timers, and more.Note: I did find that while remotely checking, I would have to, from the Account tab, tap the Location symbol to change it to a Cloud symbol, then immediately change them back, to get a readout. Took all of a few seconds.Note2: Create an account after downloading the app to use the remote capability. Local Bluetooth only use does not require an account.

This works great and is easy to use. There are plenty of YouTube vids if you need help syncing the sensor to your phone or the little LED receiver. Turns out I didn't need the rubber ring spacers because the kit with sensors has spacers that can be used or not. The magnets are strong, but for extra security I also use the plastic stick on universal fit holders. Very happy with this purchase. I can very accurately see the propane levels on my camping trailer.

The sensors seem to be working great in my driveway. My concern is whether they will hold once I get on the hwy. The bottom of the tank is curved so the sensors don't sit completely flat on the bottom of the tank. I don't think the magnets have a solid connection to the tank so they might bounce loose when I get some bumps. the highways here in CO can be bad with the extreme weather we get and therefore some of them have a lot of patch work that gets quite bumpy and rough. So these sensors might shake loose rolling down the hwy. Now, my set up has a full tray bottom with a lip and the tanks are down tight so I don't think the sensors will be lost, just might pop loose. I don't know if there is a way to mold the sensors with a slight curve so they sit better on the tank bottom but we will see how well these hold in place on our next camping trip.

The price was a little off-putting at first, but the peace of mind it gives me on my trips in my RV made it worth it quickly.Seems very accurate (I purposefully ran down one tank to test and it was pretty much spot on) and was easy to install them.App works well

The principle behind the sensors function is simple. Or, at least it should be if the sensor is thoughtfully designed.I have two 100# (25 gallon) tanks feeding multiple devices on my property. Tanks are mounted in an enclosure with a level base made of concrete pavers. A nice level, unchanging surface. The tanks only move when they need to be serviced or filled. Should be an ideal setup.Like most all propane tanks, the bottom of the tanks are rounded. There is no support ring - instead, the tanks sit on wheels and a metal support when vertical. The tanks CAN be used horizontally, but we don't. There is abundant clearance for the sensor.Due to the typical rounded tank, the sensor does not sit perfectly flat. A thoughtful design could fix that (3 magnets with some protrusion, for example), but that little detail was lost on whomever designed this product.Like some others have commented, we found one sensor seemed to work, at least at first. When a second sensor was activated on the adjacent tank, it went tilt.Two tanks, both newly filled today: One reads full (most of the time) and the other read 32% full when the tank was empty, then totally empty once it was completely full. Huh?!9 hours dealing with this, I contacted Mopeka Customer Service. The email response said, among other irrelevant things, that they "need to hire more sales and support staff." I don't want to hear excuses why they can't support their product, or won't.Returning the product. It just does not work as advertised, nor is it properly designed to do so.