RV Holding Tank Monitors

The SeeLeveL™ RV Holding Tank Monitor represents a massive leap forward in level measurement technology for the Recreational Vehicle industry.
The SeeLeveL II™ and SeeLeveL III™ have a combination of features, accuracy, reliability, and diagnostic capability that have never been available before.

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About SeeLeveL II Monitors

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 and systems are available to monitor up to 4 tanks, battery voltage, and LP gas levels.  See more information below.

Seelevel RV Gauges tm logo - black


Our Latest RV News

2017 Vancouver International Boat Show

January 05, 2017 Garnet is excited to be exhibiting at the 2017 Vancouver International Boat Show, January 18-22 at BC Place & Grandville Island - booth #49. For more information about our new Marine Tank Monitor, that will be available in the spring of 2017, select the button below.     For more information about…

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Learn More About RV Tank Monitors

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

Vancouver International Boat Show
January 18 – 22, 2017
Vancouver, BC
BC Place & Granville Island
Booth #49

Calgary RV Expo & Sale
January 26 – 29, 2017
Calgary, Alberta
BMO Center – Stampede Park
Booth #203

Edmonton RV Expo & Sale
February 9 – 12, 2017
Edmonton, Alberta
Edmonton Expo Centre – Northlands
Booth #155

FMCA 95th International Convention & RV Expo
March 7 – 10, 2017
Chandler, Arizona
Rawhide Wester Town & Event Center
Installation Services available on-site.  Call toll-free:  1-877-668-7813

The Seelevel System







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Have you experienced unreliable readings or false full readings just after you know you have drained the tanks? Does the resolution of 1/3 or 1/4 fail to meet your needs, especially when dry camping for extended periods?  The SeeLeveL II and SeeLeveL III solves these issues and more.

Features Benefits






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

RV Comparison Chart





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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 the optional 6” sender when placing your order.  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.