Best RV Propane Tank Gauges
Compare ultrasonic RV propane monitors, steel versus aluminum cylinder fit, and why pressure dials do not measure remaining fuel.
Compare Current OptionsRunning out of propane can shut down the furnace, water heater or cooking system at the wrong time. The difficult part is choosing a measurement method: a dial on a regulator may show pressure, but it does not track gallons remaining like an ultrasonic sensor. Material, mounting clearance and whether the RV has portable DOT cylinders or a built-in ASME tank determine the right approach.
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01 RV propane gauge shortlist
Four exact manufacturer-documented devices: three fixed ultrasonic sensors and one handheld LPG level finder.
Magnet-mounted on the bottom of steel LPG cylinders, with spacers for common 20, 30 and 40 lb DOT sizes. Mopeka lists horizontal and vertical steel tanks and smartphone or compatible LED-display reading.
Adds selectable liquid types, configurable alerts, orientation aids and temperature sensing. Mopeka specifies magnetic bottom mounting on steel tanks and horizontal or vertical orientations.
The nonmagnetic Universal variant uses a collar rather than relying on magnets, and Mopeka identifies a separate collar set for aluminum LP cylinders.
Truma LevelCheck reads the presence of liquid LPG at the contact point, with red/green feedback. Truma specifies steel or aluminum cylinders 8–14 inches in diameter.
02 Compare reading methods
These devices measure or locate liquid level ultrasonically. They do not connect to the propane flow path or replace a regulator.
| Exact model | Measurement type | Readout and power | Best fit |
|---|---|---|---|
| Mopeka Pro Check M1017012 | Bottom-mounted ultrasonic sensor | Bluetooth app · CR2032 battery | Best for standard steel RV cylinders |
| Mopeka Pro Check Universal Steel M1017023 | Universal-series ultrasonic sensor | Bluetooth · replaceable CR2032 | Best upgraded app-based monitor |
| Mopeka Pro Check Universal Nonmagnetic M1017024 | Collar-mounted ultrasonic sensor | Bluetooth · mounting collar | Best for compatible aluminum cylinders |
| Truma LevelCheck | Handheld ultrasonic level detector | 9V battery · red/green indication | Best handheld spot-check |
03 Four propane monitoring options
Selections reflect documented cylinder compatibility and features; no fabricated accuracy testing or live pricing is claimed.
Mopeka Pro Check M1017012
Magnet-mounted on the bottom of steel LPG cylinders, with spacers for common 20, 30 and 40 lb DOT sizes. Mopeka lists horizontal and vertical steel tanks and smartphone or compatible LED-display reading.
Best fit: Steel portable cylinders when the owner wants an actual liquid-level estimate rather than a pressure dial.
Steel portable cylinders when the owner wants an actual liquid-level estimate rather than a pressure dial.
One sensor per tank; fiberglass tanks are excluded. Confirm clearance under the cylinder and the app region.
Manufacturer documentation: Exact product page. Published specifications are not independent performance tests.
Check PriceMopeka Pro Check Universal Steel M1017023
Adds selectable liquid types, configurable alerts, orientation aids and temperature sensing. Mopeka specifies magnetic bottom mounting on steel tanks and horizontal or vertical orientations.
Best fit: Steel RV cylinders where configurable alerts and enhanced sensor features matter.
Steel RV cylinders where configurable alerts and enhanced sensor features matter.
Do not buy the steel magnetic variant for a nonmagnetic aluminum or composite tank.
Manufacturer documentation: Exact product page. Published specifications are not independent performance tests.
Check PriceMopeka Pro Check Universal Nonmagnetic M1017024
The nonmagnetic Universal variant uses a collar rather than relying on magnets, and Mopeka identifies a separate collar set for aluminum LP cylinders.
Best fit: Compatible aluminum cylinders whose bottoms cannot hold a magnetic sensor.
Compatible aluminum cylinders whose bottoms cannot hold a magnetic sensor.
Confirm the exact tank material, approved mounting collar and product-specific propane compatibility; not for fiberglass tanks.
Manufacturer documentation: Exact product page. Published specifications are not independent performance tests.
Check PriceTruma LevelCheck
Truma LevelCheck reads the presence of liquid LPG at the contact point, with red/green feedback. Truma specifies steel or aluminum cylinders 8–14 inches in diameter.
Best fit: Owners who prefer a quick manual check without installing Bluetooth sensors or maintaining an app.
Owners who prefer a quick manual check without installing Bluetooth sensors or maintaining an app.
This is a point-in-time level finder, not a continuously updated percentage monitor. Not intended for refillable tank-gas cylinders per Truma catalog.
Manufacturer documentation: Exact product page. Published specifications are not independent performance tests.
Check Price04 Seven compatibility checks
Choose the correct sensor before handling propane cylinders; do not modify tank valves or safety equipment.
- Identify portable versus permanently mounted tanks: These bottom-mounted sensors are suited to compatible cylinders with accessible bottoms; built-in ASME tanks may have different sender and monitor arrangements.
- Check the cylinder material: Steel magnets, aluminum collar systems and composite cylinders have different compatibility requirements. Do not assume a steel sensor works on every tank.
- Measure bottom clearance: A bottom sensor and spacer must fit without being crushed by the cylinder ring or obstructed by mounting hardware.
- Set the correct tank geometry in the app: Select the cylinder size and orientation specified by the manufacturer. An incorrect tank profile can distort percentage estimates.
- Plan for one sensor per tank: A dual-cylinder RV needs two sensors for independent monitoring; an optional indoor display or Wi-Fi bridge may be sold separately.
- Understand pressure-gauge limitations: A pressure dial mainly reflects propane vapor pressure and temperature while liquid remains, so it cannot reliably show the remaining liquid percentage.
- Follow propane handling safety: Turn off appliances as instructed before servicing, keep ignition sources away, and do not modify valves, fittings or sensors. Have gas-system issues handled by qualified personnel.
05 Choose for your tank type
Steel 20/30/40 lb DOT cylinder: Mopeka Pro Check is the straightforward bottom-mounted option. Choose Universal Steel if customizable alerts and sensor enhancements justify the upgrade.
Aluminum cylinder: confirm the approved collar system and exact sensor variant before buying. A steel magnetic model will not attach directly.
No app or permanent installation: Truma LevelCheck can identify the liquid boundary manually, but it will not display a continuously updated percentage.
Built-in ASME tank: inspect the installed tank sender and monitor first; these portable-cylinder products may not be suitable.
Propane-consuming appliances: a tankless RV water heater can increase demand during showers; monitor fuel but do not treat a gauge as a gas-system safety device.
06 Frequently asked questions
Are propane pressure gauges accurate for tank fullness?
Not for precise liquid quantity. Vapor pressure changes with temperature and remains relatively stable while liquid propane is present, so a dial cannot reliably show how much is left.
Can a Mopeka sensor work on a 30-pound RV propane tank?
Yes, Mopeka lists common 20, 30 and 40 lb DOT cylinders for its Pro Check line, subject to the specific tank material and sensor mounting requirements.
Do I need two sensors for two propane tanks?
Yes, if you want to monitor each tank separately. A single bottom sensor reads one tank, not the combined propane in both cylinders.
Will a magnetic propane sensor work on aluminum?
No magnetic attachment to aluminum. Use a manufacturer-approved nonmagnetic mounting solution and confirm that the exact sensor variant supports the cylinder.
Is Truma LevelCheck a continuous monitor?
No. It is a handheld ultrasonic detector that identifies whether liquid LPG is present at the spot you check.
Will these gauges work on a motorhome built-in ASME tank?
Do not assume so. Permanently mounted ASME tanks often have their own float sender or compatible monitor system. Verify the tank design and sensor access before buying.
07 Measure liquid not pressure
For a compatible steel portable cylinder, Mopeka’s bottom-mounted ultrasonic approach is more informative than a pressure dial. Choose Universal features only if useful, or Truma LevelCheck for occasional manual readings. Confirm material, size, access and mounting before ordering, and keep propane-system service separate from monitoring accessories.