RV Holding Tank Monitors

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SeeLeveL II - The premium monitor you can rely on.

The SeeLeveL II™ RV Tank Monitor series is available in many different configurations to meet most any motorhome, fifth wheel or travel trailer tank configuration. Each system provides tank level information using a percentage of full readout. Detailed diagnostic information is available through the system monitor.  Depending on your needs models will measure up to 4 holding tanks, propane, battery voltage and temperature. Other features are available to activate your pump, engage your water heater, interface with RV-C or sound an alarm.  Our latest model has Bluetooth® technology which allows you to view the levels on your mobile device.  See more information below. Read our customer’s testimonials.

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Our Latest RV News

Bluetooth Technology for RV Tank Monitor!

December 04, 2017 Garnet proudly announces the launch of its new 709-BTP3 RV tank monitor.  This new gauge now has Bluetooth® wireless technology, which allows Recreational Vehicle (RV) owners to check their tank levels via their smartphone or tablet device. Tank levels and battery voltage can be displayed on a smartphone or tablet with a free…

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Learn More About RV Tank Monitors

Garnet will be exhibiting at the upcoming RV show(s):

2018 FMCA 97th International Convention & RV Expo
Mar 15-18, 2018
Georgia National Fairgrounds and Agricenter
Perry, GA  USA
Booth #806-808

2018 BC Interior RV show
Apr 22-25, 2018
Penticton Trade & Convention Centre
Penticton, BC  Canada
Booth # 15

2018 Snowbird RV show
Sep 20-23, 2018
Tradex Building
Abbotsford, BC  Canada
Booth # TBD








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This chart makes it easy to see all the features to find out which version works for you.






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The Seelevel display mounts inside the RV.   For convenience, a second display can be installed in the service bay area by the holding tanks.

To purchase an additional display select your current model under the “DISPLAYS ONLY” category.


To determine which sender configuration to use for your tanks measure the height of the tank and refer to the following table:

Sender Options Chart








SYSTEM SENDERS OPTION:  The SeeLeveL Tank Monitoring System includes 3 x 12” senders.  You can swap any of the 12” senders for optional 6” senders when placing your order.  An additional cost is applied for the 16″ option.

Note:  Do not mix sender types when stacking senders on one tank.

ADDITIONAL SENDER OPTION:  You can also purchase additional senders.  Refer to the following links for the preferred sender detail:

710JS Sender

710ES Sender

710SS Sender

For taller tanks, two stacked 710ES or 710SS senders are used.   

Tanks less than 7 inches in height will require 710JS senders due to better resolution (6″ x 4 = 24 measurements vs the 710ES or 710SS at 16 4 segments X 4).

Holding tanks must be non-conductive material (eg. plastic), system will not work on metal tanks.

Please refer to the manual for complete installation instructions.

Select this link to view our list of OEM Manufacturers installing our SeeLeveL II RV monitoring systems.