The Garnet 709-P3 SeeLevel II is the industry-leading RV tank monitoring system trusted by over 200,000 RV owners. Unlike factory-installed monitors that show vague quarter-tank increments (and often show "full" when you're not), the SeeLevel II displays actual percentage levels from 0% to 100% in 5% increments. The secret? External sensors that mount on the outside of your tanks – where sewage buildup can't affect them.3 Tanks% ReadoutPump Switch
0-100% in 5% increments
No fouling, no false readings
Built into display panel
Voltage readout included
One of the best features of the SeeLevel II system is the ability to add additional monitors at other locations in your RV. The common bus wiring allows you to connect multiple displays to the same sensor network. Popular second display locations: • Bedroom or bathroom for overnight monitoring • Outside water bay for convenient dumping • Cockpit area for quick checks while traveling • Near the galley for water conservation awareness Simply purchase an additional 709-P3 Monitor Only and wire it to your existing sensor network – no additional sensors needed!
Traditional RV tank monitors use probes that extend inside the tank. These probes quickly become coated with waste residue, toilet paper, and struvite buildup – causing the dreaded "always shows full" problem that plagues nearly every RV owner.
The SeeLevel II difference: Sensors mount externally on the tank wall using 3M adhesive. They measure tank levels through the plastic tank wall using capacitive sensing technology. No probes inside the tank means:
• Battery Voltage: Know when batteries need charging • Fresh Water Tank: Know exactly how much water remains • Grey Water Tank: Plan showers and dishwashing accordingly • Black Water Tank: Know exactly when to dump – no guessing • Water Pump: 3-way pump switch built into display panel
The SeeLevel II uses proprietary capacitive sensing technology. Flexible sensor boards adhere to the outside of each tank and measure the liquid level through the tank wall. When liquid is present, the capacitance changes – and the system displays the exact percentage.
All sensors connect via a simple 2-wire common bus network, which typically allows you to reuse your RV's existing wiring from the old tank monitor system. The display panel shows levels on a bright 3-digit LED readout – easy to read day or night.
Garnet offers three sensor sizes to match your tank heights. Sensors can be cut shorter or stacked for taller tanks:
Tip: The 710-ES3 (12") is the most popular choice and fits most standard RV tanks.
SeeLevel II sensors work on plastic/polyethylene and fiberglass tanks only. They will NOT work on metal tanks. Tank walls must be 3/8" (10mm) thick or less. The sensors measure water-soluble liquids only.
Most RV owners can install the SeeLevel II system themselves. The hardest part is accessing your tanks – the actual installation is straightforward:
Complete installation instructions included. Professional installation recommended if you're uncomfortable with electrical work.
The SeeLevel II includes diagnostic capability that allows you to check the operating characteristics of each sensor. If a sensor develops a problem, the display can show you the signal level and help identify the issue.
Want to check tank levels from the bedroom, bathroom, or wet bay? Simply add a 709-P3 Monitor Only to your system. Multiple displays can share the same sensors via the common bus wiring – no additional sensors required!
Sensors can be trimmed shorter or stacked for taller tanks. Don't mix sensor types when stacking.
Manual: SeeLevel 709 Manual (PDF) Support: garnetinstruments.com/support Warranty: 1 Year Limited