Mopeka Double Check RV Propane Tank Monitor & Sensors: Complete Review and Buyer's Guide

Everything You Need to Know About the Mopeka Double Check Propane Monitoring System-Features, How It Works, Installation, Accuracy, Smartphone App, Compatibility, Pros and Cons, and How It Compares to Other RV Propane Monitoring Solutions

Introduction: The Ultimate Dual-Tank RV Propane Monitoring Solution

For RV owners with dual propane tank setups, monitoring both tanks accurately and conveniently has always been a challenge. The Mopeka Double Check RV Propane Tank Monitor & Sensors delivers a comprehensive solution designed specifically for dual-tank RVs, providing real-time monitoring, smartphone connectivity, and precise measurements for both tanks in one integrated system.

Why the Mopeka Double Check Matters for RV Owners:

🚐 Dual-Tank Design - Purpose-built for RVs with two propane tanks

📱 Smartphone Monitoring - Check both tanks from your phone

⚡ Bluetooth Technology - Wireless connectivity up to 100 feet

📊 Precise Readings - Exact percentage and gallons for each tank

🔔 Automatic Alerts - Notifications when propane is low on either tank

🔄 Real-Time Updates - Continuous monitoring without manual checks

💰 No Monthly Fees - One-time purchase, no subscription required

This comprehensive guide covers:

What is the Mopeka Double Check system

Features and specifications

How it works with smartphone app

Installation and setup process

Accuracy and reliability testing

Compatibility with different tanks

Pros and cons

Comparison with other monitoring solutions

Troubleshooting and support

Frequently asked questions

Part 1: What Is the Mopeka Double Check RV Propane Tank Monitor?

Product Overview

The Mopeka Double Check RV Propane Tank Monitor is a complete dual-tank propane monitoring system that includes two ultrasonic sensors and integrated smartphone connectivity. Designed specifically for RV applications, this system allows you to monitor both propane tanks simultaneously from a single app interface.

What's Included in the System:

Product Specifications:

Key Features

1. Dual-Sensor Design for RVs:

Two complete sensors in one package

Monitor both propane tanks simultaneously

Perfect for travel trailers, fifth wheels, motorhomes

See both tank readings on one screen

2. Ultrasonic Sensor Technology:

Non-invasive measurement

Attaches to tank exterior (bottom)

Measures propane level through tank wall

Safe and accurate

3. Bluetooth Wireless Connectivity:

Bluetooth Low Energy (BLE) technology

Range up to 100 feet

Works through RV walls

No wiring or installation required

4. Smartphone App (iOS and Android):

Free Mopeka Tank Check app

Real-time dual-tank monitoring

Shows percentage, gallons, and time remaining for each tank

Historical usage tracking

Multiple RV/tank management

5. Automatic Low-Propane Alerts:

Customizable alert thresholds (per tank)

Push notifications to smartphone

Never run out unexpectedly

Set different thresholds for each tank

6. Precise Measurements:

Shows exact percentage (±2-3% accuracy)

Displays gallons remaining

Estimates time until empty

Much more accurate than mechanical gauges

7. Easy Magnetic Installation:

Snap-on magnetic mounting

No tools required

Installs in 5-10 minutes per tank

Secure attachment

8. Long Battery Life:

CR2032 battery per sensor

1-2 year battery life

Easy to replace

Low battery alerts in app

9. Weather Resistant Design:

IP65 rated

Works in rain, snow, extreme temperatures

Built for outdoor RV use

Durable construction

10. No Monthly Fees or Subscriptions:

One-time purchase

Free app with lifetime updates

No recurring costs

No hidden fees

Part 2: How the Mopeka Double Check System Works

Operating Principle

The Mopeka Double Check uses ultrasonic sensor technology combined with Bluetooth connectivity to provide real-time propane monitoring for both tanks.

Step 1: Ultrasonic Measurement:

Sensor attaches magnetically to tank bottom

Emits ultrasonic waves through tank wall

Waves travel through propane liquid

Measures distance to liquid surface

Calculates exact propane volume

Step 2: Data Transmission:

Sensor calculates propane level

Data transmitted via Bluetooth Low Energy

Sends to smartphone app

Updates every 1-5 minutes (configurable)

Step 3: Smartphone Display:

Open Mopeka Tank Check app

View real-time levels for BOTH tanks

See percentage, gallons, and time remaining

Receive alerts when either tank is low

How to Use the System

Daily Monitoring:

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1. Open Mopeka Tank Check app on smartphone 2. App automatically connects to both sensors 3. View propane levels for both tanks: - Tank 1: 68% (4.8 gallons) - Tank 2: 45% (3.2 gallons) 4. Total propane: 8.0 gallons remaining 5. Plan refills based on actual data

Setting Up Alerts:

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1. In app, set custom alert threshold for each tank: - Tank 1: Alert at 30% - Tank 2: Alert at 25% 2. App sends notification when tank reaches threshold 3. Different thresholds for each tank (flexible) 4. Never run out on either tank

Tracking Usage:

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1. View historical usage for both tanks 2. See daily/weekly consumption 3. Compare usage between tanks 4. Plan for long trips 5. Understand your consumption patterns

Smartphone App Features

Mopeka Tank Check App Capabilities:

Main Dashboard:

Dual-tank display (side-by-side view)

Real-time percentage for each tank

Gallons remaining per tank

Total combined propane

Estimated time until empty

Alert System:

Customizable thresholds (per tank)

Push notifications

Low battery alerts

Sensor disconnect alerts

Historical Data:

Usage graphs (daily, weekly, monthly)

Consumption trends

Compare tanks over time

Export data (optional)

Multi-RV Management:

Add multiple RVs/locations

Manage up to 10 tanks total

Switch between locations

Name each tank (e.g., "Front Tank", "Rear Tank")

Settings:

Tank size configuration (20/30/40 lb)

Update interval (1-60 minutes)

Temperature unit (°F/°C)

Notification preferences

Part 3: Installation and Setup Guide

Step-by-Step Installation

Time Required: 10-15 minutes (for both sensors)

Tools Needed: None

Step 1: Download the App:

Download Mopeka Tank Check app from:

Apple App Store (iOS)

Google Play Store (Android)

App is free to download

Create account (optional but recommended for multi-device sync)

Step 2: Prepare Your Tanks:

Locate both propane tanks

Ensure tanks are accessible

Clean bottom of each tank if dirty

Tanks can be full or partially filled

Step 3: Install Sensor on Tank 1:

Remove Sensor 1 from packaging

Remove battery protector tab

Sensor will activate automatically

Place sensor on bottom center of Tank 1

Magnetic base will snap onto tank

Ensure sensor is secure and level

Step 4: Install Sensor on Tank 2:

Repeat Step 3 for Tank 2

Ensure both sensors are centered

Both sensors should be level

Step 5: Pair Sensors with Smartphone:

Open Mopeka Tank Check app

Tap "Add New Tank" or "+"

App will scan for sensors via Bluetooth

Both sensors should appear automatically

Tap to add each sensor

Name each sensor:

"Tank 1 - Front" or "Driver Side"

"Tank 2 - Rear" or "Passenger Side"

Step 6: Configure Tank Settings:

For each sensor, select tank size:

20 lb (BBQ and small trailers)

30 lb (most travel trailers)

40 lb (larger RVs, motorhomes)

App will calibrate based on tank size

Wait 2-5 minutes for initial reading

Step 7: Verify Readings:

Check that app shows levels for both tanks

If tank is known to be full, should show 75-100%

If tank is empty, should show 0-5%

Readings stabilize within 5-10 minutes

Step 8: Set Up Alerts:

Configure low-propane alert for each tank

Recommended: 25-30% for alerts

Enable push notifications

Test alert system

Installation Tips

For Best Performance:

✅ Install on clean, dry tank bottom

✅ Position sensor at center of tank bottom

✅ Ensure sensor is level and flat

✅ Keep sensor away from tank edges

✅ Wait for reading to stabilize before relying on it

What to Avoid:

❌ Installing on wet or dirty tank surface

❌ Placing sensor off-center

❌ Installing on curved or uneven surface

❌ Covering sensor with insulation or covers

❌ Installing on aluminum tanks (magnet won't hold)

Sensor Placement for Different Tank Orientations:

Horizontal Tanks (Most RVs):

Mount sensor on lowest point of tank bottom

Sensor will be slightly tilted-this is normal

Ensure magnetic contact is secure

Vertical Tanks (Some Travel Trailers):

Mount sensor on bottom center

Sensor will be flat

Most accurate orientation

Part 4: Accuracy and Reliability

How Accurate Is the Mopeka Double Check?

Accuracy Rating: ±2-3%

What This Means:

If app shows 50%, actual level is 47-53%

Very accurate compared to mechanical gauges (±15-20%)

Reliable enough for precise planning

One of the most accurate consumer propane monitors available

Accuracy Comparison

Factors Affecting Accuracy

1. Sensor Position:

Center placement = best accuracy

Off-center = may reduce accuracy slightly

Level placement = optimal

2. Tank Condition:

Clean tank bottom = better readings

Rust or debris = may affect readings

Steel tanks work best

3. Temperature:

Extreme cold may slightly affect readings

Sensor designed for -4°F to 140°F

Operates reliably in most conditions

4. Initial Calibration:

Wait 5-10 minutes for first reading

Readings improve after initial period

App learns tank characteristics

Real-World Reliability

User Feedback:

✅ Highly rated by RV owners (4.5+ stars average)

✅ Consistent performance in various conditions

✅ Accurate enough for practical use

✅ Battery life as advertised (1-2 years)

✅ App stable and user-friendly

⚠️ Bluetooth range may vary based on RV construction

⚠️ Initial setup may require patience

Part 5: Compatibility and Tank Sizing

Compatible Tanks

Tank Sizes:

✅ 20 lb tanks (standard BBQ cylinders, small trailers)

✅ 30 lb tanks (common in travel trailers, fifth wheels)

✅ 40 lb tanks (common in motorhomes, larger RVs)

✅ Larger portable tanks (up to 100 lb)

❌ Very large stationary tanks (use different Mopeka products)

Tank Types:

✅ Steel tanks (magnetic attachment works)

⚠️ Aluminum tanks (magnet may not hold-use adhesive option)

❌ Composite/fiberglass tanks (will not work-no magnetic attachment)

❌ Underground tanks (use different monitoring systems)

Tank Orientation:

✅ Horizontal tanks (most RVs)

✅ Vertical tanks (some trailers)

Works in both orientations with proper placement

How to Determine Your Tank Size

Check the Tank Collar:

Look at metal collar on top of tank

Find "WC" (Water Capacity) stamp

Or look for "30 LB" or "40 LB" marking

Common RV Tank Sizes:

For Dual-Tank RVs:

Most travel trailers: Two 30 lb tanks

Fifth wheels: Two 30 lb or 40 lb tanks

Motorhomes: Two 40 lb tanks

The Mopeka Double Check is perfect for these setups

Part 6: Pros and Cons

Advantages (Pros)

1. Purpose-Built for Dual-Tank RVs ⭐:

Two sensors in one package

Monitor both tanks simultaneously

Perfect for most RV setups

Single app for both tanks

2. High Accuracy ⭐:

±2-3% accuracy

Much better than mechanical gauges

Reliable for planning refills

Precise measurement

3. Smartphone Convenience ⭐:

Check both tanks from phone

No need to physically inspect tanks

Works through RV walls

Easy-to-use app

4. Automatic Alerts ⭐:

Never run out unexpectedly

Customizable thresholds per tank

Push notifications

Peace of mind

5. Better Value Than Buying Singles:

$90-130 for 2-pack

vs. $130-146 for two single sensors

Save $10-20+ by buying double pack

6. No Monthly Fees:

One-time purchase

No subscription required

No hidden costs

Free app updates

7. Easy Installation:

No tools required

Magnetic snap-on

10-15 minutes for both sensors

DIY-friendly

8. Battery Powered:

No wiring needed

Replaceable battery

1-2 year battery life

Easy battery replacement

9. Historical Data:

Track propane usage

Understand consumption

Plan for trips

Compare tanks

10. Weather Resistant:

IP65 rated

Works in rain, snow, extreme temps

Built for outdoor RV use

Durable construction

Disadvantages (Cons)

1. Bluetooth Range Limitations:

100 feet maximum range

May not work from far inside RV

Metal RV construction can reduce range

Need to be relatively close to tanks

2. Requires Smartphone:

Must have iOS or Android phone

Not useful without smartphone

App required for monitoring

Tech-savvy users benefit most

3. Battery Replacement:

Battery lasts 1-2 years

Need to replace eventually

Small additional cost

CR2032 batteries inexpensive (~$2-5 each)

4. Only Works on Steel Tanks:

Magnetic attachment requires steel tank

Aluminum tanks may not hold magnet

Composite tanks incompatible

Check your tank material before purchase

5. Initial Setup Learning Curve:

May take time to pair both sensors

App has learning curve

Initial calibration needed

Requires patience first time

6. Price Higher Than Mechanical Gauges:

$90-130 for system

More expensive than basic gauges ($25-45 each)

But much more accurate and feature-rich

Investment for convenience and accuracy

Part 7: Comparison with Other RV Propane Monitoring Solutions

Mopeka Double Check vs. Single Pro Check Sensors

Conclusion: For dual-tank RVs, the Double Check (2-pack) is better value.

Mopeka Double Check vs. Generac 4G LTE Monitor

Choose Mopeka If: You're usually within 100 feet of your RV and want dual-tank monitoring at lower cost.

Choose Generac If: You need unlimited remote access and don't mind higher cost for single tank.

Mopeka Double Check vs. Manchester Snap-On Mechanical Gauge

Choose Mopeka If: You want accuracy, smartphone convenience, and alerts.

Choose Manchester If: Budget is tight and simple visual indication is sufficient.

Part 8: Troubleshooting and Support

Common Issues and Solutions

Issue 1: Sensor Not Connecting to App

Possible Causes:

Bluetooth not enabled on phone

Sensor battery not installed correctly

Sensor too far from phone

App needs refresh

Solutions:

Enable Bluetooth on smartphone

Check battery installation (remove and reinsert)

Move closer to sensors (within 100 feet)

Close and reopen app

Restart phone if needed

Issue 2: Inaccurate Reading on One Tank

Possible Causes:

Sensor not centered on tank

Tank dirty or wet

Wrong tank size selected in app

Sensor needs recalibration

Solutions:

Reposition sensor at tank center

Clean tank bottom thoroughly

Verify tank size in app settings

Wait 10 minutes for recalibration

Issue 3: Sensor Falls Off Tank

Possible Causes:

Aluminum tank (magnet won't hold)

Dirty tank surface

Vibration during travel

Sensor not properly seated

Solutions:

Verify tank is steel (magnetic)

Clean tank surface thoroughly

Press firmly to seat sensor

Consider adhesive mounting option for aluminum tanks

Issue 4: Only One Sensor Showing in App

Possible Causes:

Second sensor not paired

Second sensor battery issue

Both sensors have same ID (rare defect)

App glitch

Solutions:

Re-pair second sensor in app

Check second sensor battery

Contact Mopeka support if sensors have same ID

Uninstall/reinstall app

Issue 5: Alerts Not Working

Possible Causes:

Notifications disabled in phone settings

Alert threshold not set correctly

App running in background

Phone settings blocking notifications

Solutions:

Enable notifications in phone settings

Check alert threshold in app (set to 25-30%)

Keep app running in background

Allow app to send notifications

Customer Support

Mopeka Products Support:

Website: mopekaproducts.com

Email: support@mopekaproducts.com

Phone: Check website for current number

Contact for warranty issues

AP Products Support (if purchased as AP Products 024-1002):

Website: approducts.net

Phone: 517-278-8521

Contact for warranty issues

Product questions

App Support:

In-app help section

Mopeka website FAQ

Video tutorials online

Email support

Part 9: Frequently Asked Questions

Q1: What is the Mopeka Double Check RV Propane Tank Monitor?

A: A dual-sensor propane monitoring system designed for RVs with two propane tanks. The system includes:

Two ultrasonic sensors

Bluetooth connectivity to smartphone

Free Mopeka Tank Check app (iOS/Android)

Real-time monitoring of both tanks

Automatic low-propane alerts

±2-3% accuracy

Perfect for: Travel trailers, fifth wheels, motorhomes with dual propane tanks.

Q2: How does the Mopeka Double Check work?

A: Three-step process:

Step 1: Sensors attach magnetically to tank bottoms and emit ultrasonic waves to measure propane level

Step 2: Data transmitted via Bluetooth to smartphone app

Step 3: App displays real-time levels for both tanks, including percentage, gallons, and alerts

No wiring, no tools, installs in minutes.

Q3: What's included in the Mopeka Double Check package?

A: Complete system includes:

Everything needed for dual-tank monitoring.

Q4: How accurate is the Mopeka Double Check?

A: ±2-3% accuracy, which is excellent for consumer propane monitoring. This means:

If app shows 50%, actual is 47-53%

Much more accurate than mechanical gauges (±15-20%)

Reliable for planning refills

Suitable for precise monitoring

One of the most accurate consumer monitors available.

Q5: Will the Mopeka Double Check work with my RV propane tanks?

A: Works with most RV propane tanks:

Compatible:

✅ 20 lb, 30 lb, 40 lb steel tanks

✅ Horizontal and vertical tanks

✅ Most travel trailers, fifth wheels, motorhomes

NOT Compatible:

❌ Aluminum tanks (magnet won't hold well)

❌ Composite/fiberglass tanks

❌ Underground tanks

Check your tank material (steel = magnetic) before purchasing.

Q6: Do I need a smartphone to use this system?

A: Yes, a smartphone is required. The system works with:

iOS devices (iPhone, iPad) running iOS 11+

Android devices running Android 6.0+

The app is essential for:

Viewing propane levels

Receiving alerts

Tracking usage

Managing both tanks

Without a smartphone, you cannot use this product.

Q7: What is the Bluetooth range?

A: Up to 100 feet (30 meters) in ideal conditions. However:

Metal RV walls may reduce range to 50-75 feet

Range affected by construction materials

Must be within range for app to update

Sufficient for most RV use cases

Cannot monitor from remote location (for that, consider Generac 4G LTE).

Q8: How long does the battery last?

A: 1-2 years typical use with the included CR2032 battery per sensor. Battery life depends on:

How often app checks for updates

Temperature exposure

Sensor activity

Replacing the battery:

CR2032 batteries are common (~$2-5 each)

Easy to replace yourself (pop off cover)

No tools required

App provides low battery alert

Q9: Can I monitor both tanks from one app?

A: Yes, absolutely! The Mopeka Tank Check app is designed for multi-tank monitoring:

Features:

View both tanks on one screen

Side-by-side comparison

Individual readings per tank

Set different alert thresholds per tank

Total combined propane display

The Double Check system is specifically designed for this.

Q10: Is there a monthly subscription fee?

A: No monthly fees! The Mopeka Double Check system is:

One-time purchase ($90-130)

Free app download

No subscription required

No hidden costs

Free app updates

Unlike some remote monitoring systems, you own it outright.

Conclusion: The Best Dual-Tank RV Propane Monitoring Solution

The Mopeka Double Check RV Propane Tank Monitor & Sensors delivers everything RV owners need for accurate, convenient dual-tank propane monitoring.

Key Takeaways:

Purpose-built for dual-tank RVs - Two sensors in one system, perfect for most RVs

High accuracy (±2-3%) - Reliable readings for precise planning

Smartphone convenience - Check both tanks from your phone within 100 feet

Automatic alerts - Never run out on either tank unexpectedly

Better value than buying singles - Save $10-20+ compared to two separate sensors

No monthly fees - One-time purchase, free app, no subscription

Easy installation - Magnetic snap-on, no tools, 10-15 minutes

Works on most RV tanks - 20 lb, 30 lb, 40 lb steel tanks

Battery-powered - 1-2 year battery life, easy replacement

Weather resistant - Built for outdoor RV use in all conditions

Who should buy this: RV owners with dual propane tank setups who want accurate, convenient monitoring with smartphone alerts. Ideal for tech-savvy RVers who want to eliminate propane anxiety.

Who should consider alternatives: Those needing unlimited remote access (Generac 4G LTE), those with aluminum or composite tanks (won't work), or those on a tight budget (Manchester Snap-On).

The Mopeka Double Check RV Propane Tank Monitor & Sensors is the best dual-tank propane monitoring solution available for RV owners who want accuracy, convenience, and peace of mind.

Last Updated: July 2026

Complete Review: Mopeka Double Check RV Propane Tank Monitor & Sensors

Disclaimer: Product specifications, pricing, and availability may change. Always verify current information before purchasing. This review is for informational purposes based on product features and general user experiences.