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709-BTP3 SeeLeveL II Tank Monitor

Product Overview

The 709-BTP3 tank monitor is one of our latest models that has Bluetooth® wireless technology which allows you to view your tank levels on a mobile device.

Designed for accurate level measurement of motorhomes and trailers with three holding tanks. This system monitors battery voltage, fresh, grey, and black water levels as well as the LPG tank. The level in percent is shown on a three-digit LED display. This model includes a 3-way pump switch with a connector that allows for more wiring options.  Download the free mobile app that is available on compatible devices for Android on Google Play and for and Apple iOS the App Store.

System includes  (1) display monitor, (3) tank senders, and (1) pigtail.

Note: For convenience, a second display console can be added to a system by installing it in the service bay area by the holding tanks. Select the “Display monitor only” to purchase.




Purchase at RVupgrades.com using the following links:


Purchase by calling our Canadian office at 1-800-617-7384 and select option 2.

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Precision accuracy – The SeeLeveL II ™ RV tank monitor provides percentage full, accurate tank measurement readouts. These readouts are accurate within 3/8 of an inch.

Simple to install – Two wires connect to your existing system wires and function on a common bus system. Accessible tanks are easy to retrofit.

Reliable external sensors – Our trouble-free senders adhere externally to the holding tanks eliminating sewage build-up on the sensors.

Customize to fit most tanks – The senders are designed to be easily shortened or two can be combined to accommodate almost any holding tank shape or size.  Note:  Will work on most plastic or poly holding tanks that contain any water-soluble products. Will not work on metal tanks.

Service and Warranty – Our professional and knowledgeable technicians are on-call to assist you with any problems you may encounter. Products offer a one-year limited warranty.

Bluetooth® technology allows you to read tank levels from a smartphone or tablet up to 30 ft. (9 metres) away.  Note:   The Bluetooth display should not be mounted inside a metal enclosure as the Bluetooth range may be affected.

Resolution:  3/8 inch (10 mm)

Accuracy:  +/- 8% or better, limited by resolution and tank shape

Operating temperature range:  +32 to +140 °F (0 to + 60 °C)

Sender materials:  0.008” thick glass epoxy circuit board with conformal coating for circuit protection.  Laminated on the back with 3M 300LSE Bonding Adhesive.

Sender length range:  4-1/2 to 12 inches, which will measure tank heights from 5” to 14” (single sender) and up to 26” (dual senders).

Display mounting panel:  Black flush mount panel, approximately 4” wide by 2.8” high by 1” deep (102mm wide X 71mm high X 25mm deep).  Panel screws to wall.  Required cutout size is 3” wide by 1.8” high.

System power requirements:  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.

Wiring:  A single two-wire conductor required from the display to the senders. All the senders are wired in parallel. 12 V power and ground required for display. Single wire required for LPG sender if the sender is grounded at the tank.

LPG:  Display will work with an LPG sender with a maximum resistance of 50 ohms to 500 ohms.  The display shows increasing level as resistance increases.  The system must be calibrated with the LPG tank full, or it can be factory calibrated.

Pump Switch:  The pump switch is rated for a maximum of 10 amps. The use of a relay is required if more than 10 amps are needed. We recommend using a 10 amp fuse inline with the switch.