TowCheckNumbers before miles

TowCheck field guide · Propane planning

Best propane tank scales and gauges for RV planning

A propane indicator is a planning aid, not a leak test or permission to ignore cylinder, regulator, hose, compartment, and appliance inspections.

Source-reviewed 3 products compared
See the short listRun the calculator
Original editorial still life of three generic propane-level measuring formats beside an unbranded cylinder
Original TowCheck editorial artwork. Generic equipment is shown; product-format diagrams below are not scale replicas.

01 · Start here

Distinct fits, not a universal winner

Choose the operating pattern that resembles your setup, then verify every capacity and compatibility constraint.

01

Mopeka Pro Check Universal

The continuous-monitoring choice when the exact sensor version, mounting method, tank material, diameter, and mobile-device workflow all match.

Best suited for
Ongoing phone-visible level trends on a compatible cylinder or tank
Key limitation
Installation quality, tank-bottom condition, fluid selection, geometry, and Bluetooth range affect usefulness; an app percentage is not a certified fill measurement.
Important specification
Method: Bottom-mounted ultrasound
Verify before buying
The reviewed steel-tank version magnetically mounts to compatible steel cylinders and tanks. Aluminum or non-magnetic applications need the documented collar/mounting arrangement and the correct Universal configuration.
Read the fit notes
View manufacturer specifications
Product links always retain a documented non-affiliate fallback.
02

Truma LevelCheck

The handheld option for compatible steel or aluminum LPG cylinders when you are comfortable scanning the cylinder wall for the liquid/gas transition.

Best suited for
A quick local spot check without a permanently installed sensor
Key limitation
It reports propane at the contact point rather than a continuous percentage. Surface condition, internal obstructions, contact angle, and scanning technique can produce unhelpful readings.
Important specification
Method: Handheld ultrasound spot check
Verify before buying
Documented for steel or aluminum LPG cylinders about 200–350 mm (8–14 inches) in diameter; the current instructions exclude plastic cylinders and other unsupported container shapes.
Read the fit notes
View manufacturer specifications
Product links always retain a documented non-affiliate fallback.
03

Camco 59023 Propane Gauge / Leak Detector

The low-complexity option when its Type 1 connection fits and broad pressure bands are enough; it is not a true liquid-level scale.

Best suited for
A simple inline pressure-band indication on a compatible Type 1 cylinder connection
Key limitation
Pressure in an LPG cylinder stays relatively stable through much of its usable fill and changes with temperature. The dial should not be treated as a precise remaining-fuel percentage.
Important specification
Method: Inline pressure indication
Verify before buying
For the documented Type 1/ACME connection on applicable cylinders manufactured after 1995; confirm regulator, compartment, hose clearance, connection orientation, and local code requirements.
Read the fit notes
View manufacturer specifications · CamcoView at eTrailer · eTrailer
Product links always retain a documented non-affiliate fallback.

Calculate first

Estimate propane runtime from the actual load

Use cylinder capacity, appliance input, duty cycle, temperature, and reserve assumptions before deciding how much monitoring detail is useful.

Open calculator

02 · Comparison

Fit-critical specifications at a glance

Price markers are relative within this comparison, not live quotes. Use each product’s source record for current specifications and availability.

Focus:
Product specifications and fit comparison
ProductBest forMethodDocumented fitReadoutPowerRelative priceDetails
Mopeka Pro Check UniversalVerified 2026-07-22Ongoing phone-visible level trends on a compatible cylinder or tankBottom-mounted ultrasoundVersion-specific steel / non-steel fitBluetooth app / compatible monitorReplaceable CR2032$$Deep dive
Truma LevelCheckVerified 2026-07-22A quick local spot check without a permanently installed sensorHandheld ultrasound spot checkSteel/aluminum LPG, 8–14 in diameterLocal LED indication9 V battery$$$Deep dive
Camco 59023 Propane Gauge / Leak DetectorVerified 2026-07-22A simple inline pressure-band indication on a compatible Type 1 cylinder connectionInline pressure indicationType 1 / ACME cylinder connectionLocal colour-band dialNone$Deep dive

Ongoing phone-visible level trends on a compatible cylinder or tank

Mopeka Pro Check Universal

Method
Bottom-mounted ultrasound
Documented fit
Version-specific steel / non-steel fit
Readout
Bluetooth app / compatible monitor
Power
Replaceable CR2032
Relative price
$$
Read the deep dive

A quick local spot check without a permanently installed sensor

Truma LevelCheck

Method
Handheld ultrasound spot check
Documented fit
Steel/aluminum LPG, 8–14 in diameter
Readout
Local LED indication
Power
9 V battery
Relative price
$$$
Read the deep dive

A simple inline pressure-band indication on a compatible Type 1 cylinder connection

Camco 59023 Propane Gauge / Leak Detector

Method
Inline pressure indication
Documented fit
Type 1 / ACME cylinder connection
Readout
Local colour-band dial
Power
None
Relative price
$
Read the deep dive

03 · How we evaluated

The criteria behind the short list

We favour documented constraints and reproducible setup over feature count. These pages do not represent hands-on laboratory testing unless explicitly stated.

  1. 01

    Measurement principle: liquid-contact ultrasound, ultrasonic spot check, pressure indication, or true weighing—and the limits of the chosen method.

  2. 02

    Cylinder material, diameter, shape, connection, bottom access, compartment clearance, and whether a permanent mount is permitted.

  3. 03

    Local versus remote readout, battery service, app/device dependency, temperature range, and repeatability of the operating procedure.

  4. 04

    Current instructions for installation, leak checking, cylinder handling, regulator compatibility, warranty, and removal from service.

04 · Product notes

Where each option fits—and where it does not

Each recommendation is conditional. The “avoid when” note matters as much as the feature list.

Method
Bottom-mounted ultrasound
Documented fit
Version-specific steel / non-steel fit
Readout
Bluetooth app / compatible monitor

Pick 1 · Ongoing phone-visible level trends on a compatible cylinder or tank

Mopeka Pro Check Universal

The continuous-monitoring choice when the exact sensor version, mounting method, tank material, diameter, and mobile-device workflow all match.

Why it fits

The sensor reads liquid level ultrasonically from the tank bottom and publishes temperature, battery, material, and size boundaries for the Universal family.

Strengths

  • Supports repeat readings without lifting the cylinder
  • Published material and geometry boundaries
  • Temperature and battery status are documented

Tradeoffs

  • Requires correct mounting and setup
  • Phone or compatible remote needed for the reading
Compatibility check
The reviewed steel-tank version magnetically mounts to compatible steel cylinders and tanks. Aluminum or non-magnetic applications need the documented collar/mounting arrangement and the correct Universal configuration.
Avoid when
The tank bottom is inaccessible, the material/diameter falls outside the current instructions, or a no-phone spot check is preferable.
Published limitation
Installation quality, tank-bottom condition, fluid selection, geometry, and Bluetooth range affect usefulness; an app percentage is not a certified fill measurement.
Warranty record
Mopeka’s reviewed consumer specification page states a one-year warranty; confirm the market-specific written terms for the exact sensor package.
View manufacturer specifications
Check your requirement
Method
Handheld ultrasound spot check
Documented fit
Steel/aluminum LPG, 8–14 in diameter
Readout
Local LED indication

Pick 2 · A quick local spot check without a permanently installed sensor

Truma LevelCheck

The handheld option for compatible steel or aluminum LPG cylinders when you are comfortable scanning the cylinder wall for the liquid/gas transition.

Why it fits

Truma documents a simple ultrasonic contact test, a narrow cylinder-diameter range, approved cylinder materials, environmental limits, and a replaceable 9-volt battery.

Strengths

  • No permanent sensor or app
  • Works across documented steel and aluminum cylinders
  • Published operating technique and fit range

Tradeoffs

  • Requires manual scanning
  • Not a continuous percentage display
Compatibility check
Documented for steel or aluminum LPG cylinders about 200–350 mm (8–14 inches) in diameter; the current instructions exclude plastic cylinders and other unsupported container shapes.
Avoid when
You need remote monitoring, the cylinder is inaccessible, or the tank material/shape is outside Truma’s written fit limits.
Published limitation
It reports propane at the contact point rather than a continuous percentage. Surface condition, internal obstructions, contact angle, and scanning technique can produce unhelpful readings.
Warranty record
The reviewed U.S. product page states 12 months, extendable to 24 months with registration; confirm registration timing and current local terms.
View manufacturer specifications
Check your requirement
Method
Inline pressure indication
Documented fit
Type 1 / ACME cylinder connection
Readout
Local colour-band dial

Pick 3 · A simple inline pressure-band indication on a compatible Type 1 cylinder connection

Camco 59023 Propane Gauge / Leak Detector

The low-complexity option when its Type 1 connection fits and broad pressure bands are enough; it is not a true liquid-level scale.

Why it fits

Camco’s current catalogue documents the connection family, post-1995 cylinder context, pressure indication, leak-check use, thermal protection, and excess-flow protection.

Strengths

  • No battery or app
  • Straightforward local indication
  • Catalogue documents protective connection features

Tradeoffs

  • Not a precise liquid-level measurement
  • Adds another threaded connection
Compatibility check
For the documented Type 1/ACME connection on applicable cylinders manufactured after 1995; confirm regulator, compartment, hose clearance, connection orientation, and local code requirements.
Avoid when
You need continuous liquid-level data, the connector does not match, or an extra inline joint would create clearance or hose-routing problems.
Published limitation
Pressure in an LPG cylinder stays relatively stable through much of its usable fill and changes with temperature. The dial should not be treated as a precise remaining-fuel percentage.
Warranty record
No product-specific current duration was found in the reviewed catalogue record; confirm Camco’s written terms for model 59023 before purchase.
View manufacturer specifications · CamcoView at eTrailer · eTrailer
Check your requirement

Decision tool

Choose the measurement method before the brand

This selector distinguishes continuous level sensing, manual spot checks, and broad pressure indication. It does not certify a propane system.

01How do you want to take the reading?
02Which fit constraint is already confirmed?

05 · Selection method

How to make the final choice

A product page tells you what a component can do. Your measured setup determines whether it belongs in the system.

01

Identify the container

Record material, nominal capacity, outside diameter, bottom shape, valve/connection, compartment clearance, and whether the cylinder is removable before selecting a measuring method.

02

Separate level from runtime

A level estimate does not predict runtime by itself. Appliance input, duty cycle, ambient temperature, regulator behaviour, reserve policy, and simultaneous loads all matter.

03

Use a repeatable check

Follow the maker’s placement and scanning procedure, compare against known fill events, and investigate implausible changes rather than assuming the display is authoritative.

Safety boundary

Before you install or operate

  • Shut appliances and ignition sources down as required before changing propane connections; leak-check every disturbed joint using the equipment maker’s approved method.
  • Never use a level device to declare a cylinder, regulator, hose, valve, compartment, or appliance safe.
  • Keep cylinders upright, secured, ventilated, and within their inspection/fill rules; do not modify a cylinder to install a sensor.
  • If propane is smelled or a leak is suspected, avoid switches and flames, leave the area, shut the supply only if safe, and obtain qualified service.

06 · Common questions

Questions to settle before checkout

Is an inline propane gauge the same as a tank scale?

No. A pressure-band gauge infers broad status from vapour pressure, which changes with temperature and remains fairly stable through much of the fill. A scale measures mass; an ultrasonic device looks for the liquid boundary.

Can one ultrasonic sensor fit every propane tank?

No. Material, diameter, bottom geometry, mounting method, supported fluid profile, and access all matter. Match the exact sensor version and instructions to the exact container.

Can a propane level monitor detect leaks?

A falling trend may prompt investigation, but it is not a certified leak detector and normal appliance use also lowers level. Use approved leak-check methods and qualified service.

Source record

Documents reviewed for this comparison

We prefer current manufacturer pages and manuals. A retailer is used where it is the clearest available record and is labeled as such.

Mopeka Pro Check Universal

Last checked July 22, 2026

Truma LevelCheck

Last checked July 22, 2026

  • Truma LevelCheck U.S. product page manufacturer · checked 2026-07-22Ultrasonic method, supported cylinder materials and diameter, physical specifications, temperature range, battery, and U.S. warranty statement.
  • Truma LevelCheck operating FAQ manual · checked 2026-07-22Contact angle, scan technique, surface cleaning, repeat measurement, and sources of incorrect indication.
  • Truma 2025 retail catalogue support · checked 2026-07-22Current product-family context and unsupported plastic/container applications.

Camco 59023 Propane Gauge / Leak Detector

Last checked July 22, 2026

Continue the check

Calculators, guides, and field checklists