RV Holding Tank Monitors

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The premium monitor you can always rely on.

With over 25-years in the recreational vehicle (RV) market and over 200,000 installations, the SeeLeveL ™ RV Holding Tank Monitor is your proven, reliable, liquid level monitoring solution. Our gauges have been installed by many high-end original equipment manufactures (OEM) companies.

Garnet’s RV monitoring systems are known as “the gauge that works” for a reason. Garnet’s state-of-the-art digital technology provides percentage of full accurate tank measurement readouts — one of the most accurate monitors available in the market.

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January 03, 2022 At Garnet, our future is as reliable as our past. The relationship between you and Garnet does not end after we ship our product. Our company structure ensures you receive the service you require. We work hard to ensure you have the confidence that we will be here to serve…

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View our product catalogue can be viewed by selecting this button.

Which SeeLeveL System Do I Need? To provide you with our best recommendations in choosing which SeeLeveL RV Monitoring system that’s right for your RV please select the following button to view our Buyer’s Guide.     Sender Swapping Options: The SeeLeveL Tank Monitoring System includes three standard 12” senders (710ES).  You can swap any of the standard 12” senders for either the optional 6” sender (710JS) or the 16″ sender (710SS) options when placing your order.  An additional cost is applied to the 16″ sender. Do you need additional senders?  You can also purchase additional senders.  Select the following links to purchase:  710JS Sender,  710ES Sender710SS Sender.




  • DO NOT mix sender types (sizes) when stacking senders on one tank.
  • Senders will work on most plastic or poly holding tanks that contain any water-soluble products.  They will not work on metal tanks.

Please refer to the manual for complete installation instructions.







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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.









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