RV Holding Tank Monitors

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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. Read our customer’s testimonials.

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BC Interior RV Show

April 12, 2017 Garnet will be exhibiting at the 2017 BC Interior  RV show on April 21 - 23 at booth #15 The show is located at the Penticton Trade & Convention Centre in Penticton, BC Canada. Come and see for yourself why Garnet’s SeeLeveL II is one of the most preferred RV…

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Learn More About RV Tank Monitors

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

Penticton Interior RV Show
April 21 – 23, 2017
Penticton Trade & Convention Centre & the SOEC
Penticton, BC  Canada
Booth #15

FMCA 96th International Convention & RV Expo
July 12 – 15, 2017
Indianapolis Fairgrounds and Events Center
Indianapolis, IN  USA
Booth #840, 842







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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.






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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.