SeeLevel Tank Monitoring Kit for Cerbo GX


This tank monitoring kit is designed to use the SeeLevel tank monitoring system with a Victron Energy Cerbo GX as we detail in this extensive blog post. Save time and effort by purchasing all the components you’ll need in one place!


  • Sensors provide accurate an easy-to-read “percentage of full” readout.
  • Can monitor any plastic tank up to 3/8″ (10 mm) thick.
  • Sensors use Garnet’s proprietary external level sensing technology – the sensors/senders stick onto the exterior side of the tank so there is no drilling or modification necessary to the tank and you’ll never have any issues by debris build-up in the tank.
  • Monitor up to 3x tanks – typically fresh, grey, and black tanks.
  • Simple integration with the Victron Energy Cerbo GX.


  • Garnett SeeLevel 709-N2K-NLP panel.
  • 1x or more 710-ES2, 12″ long sensors/senders (can be shortened to 3″ or combined with another sensor for taller tanks up to 25″ tall).
  • Custom NMEA2K RV-C to VE.Can adapter cable (6′). This special cable has a 4-pin RV-C connector on one end that plugs into the back of the SeeLevel panel and the other side has an RJ45 connector that plugs into an available VE.Can port on your Cerbo GX.

$5 flat-rate ground shipping to the continental USA!

Choose the number of 710-ES2 sensors/senders you need. Each is 12" long but can be shortened to 3" or combined with another sensor for taller tanks up to 25" tall. You'll need at least one sensor for each tank you wish to monitor (2x if you're stacking). System supports up to 3x tanks.


If you don't already have a Victron Energy Cerbo GX for system monitoring and control, you can add a discounted one to this kit below!

  • Options/Add-Ons Price: $0.00
  • Base Price: $249.00
  • Total: $0.00
SKU: VLO-006-TM-SL Category:
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709-N2K-PM Panel Details

  • Monitors battery voltage, fresh water tank, grey water tank, black water tank
  • NMEA 2000 network compatible, tank levels and capacity are available on the NMEA bus for fresh, gray, and black tanks.
  • Regularly scans senders every 10-15 seconds to keep tank level and alarm information on the NMEA 2000 bus current.
  • Also Provides accurate tank level information using a percentage of full readout
  • Tanks are monitored using Garnet’s proprietary external level sensing technology
    • This ends fouling problems caused by debris build-up in the holding tank
    • Detailed diagnostic information monitors sender operation
  • Measures tanks from 5″ up to 34″ depending on the sensors you specify
  • Tank senders connect to display via a common bus network topology which saves wiring costs
  • Uses common industry connector for ease of installation and servicing
  • The display requires 12 volts from the RV battery, the system will function from 11 volts to 16 volts
  • The current drain is less than 200mA
  • Panel Dimensions: 4″ W x 2.8″ H x 1″ D
    • Required Cutout Size: 3″ W x 1.8″ H
  • Includes: (1) Display monitor, (3) 9″ 710-AR tank senders, (1) pigtail and mounting screws
  • Limited 1-year manufacturer warranty
  • See our SeeLevel Tank Monitor Comparison Guide to help you choose the right system for your RV.

710-ES2 Sensor/Sender Details

The Garnet SeeLevel II ES2 Sensor Board is a flexible, self-adhesive printed circuit board that is mounted to the outside of your holding tanks. The 710-ES2 sender will fit tank heights from 5.5″ to 14″, and up to 25″ with stacked senders.

  • Fits tank heights: 5.5″ to 14″ (single), up to 25″ (dual).
    • On 4-tank models, the gray and galley tanks can only have one sender.
  • Number of tanks measured: up to 7 tanks.
  • Actual measurable space (height): 4″ – 12″.
  • Resolution: 3/8″ (10 mm).
  • Dimensions: 12.15″ height x 2.325″ width (height does not include tabs).
  • Works with all standard plastic RV holding tanks.
    • Will not work with metal tanks.
  • Can read liquid levels through plastic tanks up to 3/8″ (10 mm) thick
  • 710-ES2 senders are backward compatible and may be used to replace 710-ES, 710-JS, and 710-SS senders.
  • Accuracy: +/- 8% or better, limited by resolution and tank height and shape.
  • Sender material: flexible glass epoxy circuit board with conformal coating for circuit protection. Laminated on the back with 3M 300LSE bonding adhesive.
  • Operating Temperature Range: 32 degrees to 140 degrees F.
  • Sold individually.
  • Weight: 0.05 lbs.
  • Limited 1-Year Manufacturer Warranty.

Additional information

Weight 100 oz
Dimensions 10 × 10 × 5 in