Original TowCheck editorial artwork. Generic equipment is shown; product-format diagrams below are not scale replicas.
01 · Start here
Three distinct fits, not a universal winner
Choose the operating pattern that resembles your setup, then verify every capacity and compatibility constraint.
01
fixed ultrasonic
Best for 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.
Method
Bottom-mounted ultrasound
Documented fit
Version-specific steel / non-steel fit
Important limit: Installation quality, tank-bottom condition, fluid selection, geometry, and Bluetooth range affect usefulness; an app percentage is not a certified fill measurement.
Best for 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.
Method
Handheld ultrasound spot check
Documented fit
Steel/aluminum LPG, 8–14 in diameter
Important limit: 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.
Best for 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.
Method
Inline pressure indication
Documented fit
Type 1 / ACME cylinder connection
Important limit: 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.
We favour documented constraints and reproducible setup over feature count. These pages do not represent hands-on laboratory testing unless explicitly stated.
01
Measurement principle: liquid-contact ultrasound, ultrasonic spot check, pressure indication, or true weighing—and the limits of the chosen method.
02
Cylinder material, diameter, shape, connection, bottom access, compartment clearance, and whether a permanent mount is permitted.
03
Local versus remote readout, battery service, app/device dependency, temperature range, and repeatability of the operating procedure.
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.
fixed ultrasonic
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.
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.
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.
This selector distinguishes continuous level sensing, manual spot checks, and broad pressure indication. It does not certify a propane system.
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
Mopeka Pro Check Universal steel-tank product page manufacturer · checked 2026-07-22Measurement method, magnetic steel-tank installation, Bluetooth workflow, battery, operating temperature, and application examples.
Mopeka Pro Check Universal specification sheet manual · checked 2026-07-22Sensor dimensions, mounting approaches, materials, battery, wireless format, and tank-diameter boundaries for the Universal family.
Mopeka consumer solutions specifications support · checked 2026-07-22Published steel-cylinder sizes, larger-tank diameter boundary, temperature range, battery-life estimate, and warranty statement.
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 retailer specification record retailer · checked 2026-07-22Current model identity, connection photographs, installation context, and package description; merchant availability and pricing are deliberately not reproduced.
