Garnet 710-AR2 SeeLevel II 9" Sensor Board

Highest Resolution Garnet 710-AR2 SeeLevel II 9" Sensor Board

High-resolution external tank sensor designed for low-profile RV holding tanks. The 710-AR2 offers the finest resolution (0.25") of all SeeLevel sensors – ideal for shorter tanks where maximum accuracy matters most.

Overview

The Garnet 710-AR2 is a 9-inch external sensor board designed for the SeeLevel II tank monitoring system. This compact sensor is optimized for low-profile and shorter tanks commonly found in travel trailers, camper vans, and truck campers where vertical space is limited.0.25" ResolutionLow-Profile9" Tall

What sets the 710-AR2 apart is its highest resolution of any SeeLevel sensor – just 0.25" (1/4") per sensing segment. This means more measurement points packed into a shorter length, giving you the most accurate readings possible for tanks under 11 inches tall.

📊 Best-In-Class Resolution

The 710-AR2 has 0.25" resolution – the finest of all SeeLevel sensors:

710-AR2: 0.25" resolution (THIS SENSOR)
710-ES3: 0.33" resolution
710-SS2: 0.44" resolution

For low-profile tanks, this higher resolution means more sensing segments per inch, resulting in more accurate and granular tank level readings.

Key Features

Highest resolution (0.25") – most sensing segments per inch
9 inches tall – designed for low-profile tanks
External mount – adheres to outside of tank, no drilling
Trimmable – cut in 1" segments to fit tanks as short as 3"
Stackable – double-stack for tanks up to 19.5" tall
Flexible design – conforms to curved tank surfaces
3M adhesive backing – industrial-strength 300LSE bonding
Conformal coating – circuit protection for durability
Simple 2-wire connection – connects to all SeeLevel II monitors
Programmable tabs – cut tabs to identify tank type

✅ Ideal For Low-Profile Tanks

The 710-AR2 is the best choice for:

• Travel trailers with shallow underbelly tanks
• Camper vans with space-constrained installations
• Truck campers with low-profile holding tanks
• Pop-up campers with compact tank designs
• Any tank 3" to 10.5" tall where maximum resolution is desired

Because it has more sensing segments per inch than larger sensors, you get better accuracy on shorter tanks.

Tank Height Sizing Guide

Choose the right sensor based on your tank height:

Sensor Model	Length	Resolution	Single Tank	Double-Stacked
710-AR2 (This)	9"	0.25"	3.5" - 10.5"	Up to 19.5"
710-ES3	12"	0.33"	4.5" - 14"	Up to 26"
710-SS2	16"	0.44"	7.5" - 18"	Up to 34"

For tanks under 10.5", the 710-AR2 provides the best resolution. For taller tanks, consider the 710-ES3 or 710-SS2.

How It Works

Like all SeeLevel sensors, the 710-AR2 uses capacitive sensing technology to detect fluid levels through the tank wall – no contact with tank contents required. The sensor has multiple "sensing pads" along its 9-inch length, each detecting whether liquid is present at that level.

When you press a button on your SeeLevel monitor, it queries the sensor and displays the tank level as a percentage (0-100%). With 0.25" resolution, the 710-AR2 provides more data points than other sensors, giving you finer-grained readings on shorter tanks.

Cutting the Sensor to Length

The 710-AR2 can be trimmed to fit shorter tanks:

Cut in 1" increments – finer increments than the 710-ES3 or 710-SS2
Minimum length: 3" – the shortest minimum of all SeeLevel sensors
Use sharp scissors – cut between the sensing pads
More segments = better accuracy – keep as many as possible

⚠️ Do NOT Cut Shorter Than 3 Inches

The 710-AR2 requires a minimum of 3 sensing segments to function properly. Cutting the sensor shorter than 3" will result in the sensor not working. If your tank is under 3.5" tall, contact Garnet for recommendations.

Double-Stacking for Taller Tanks

For tanks taller than 10.5", two 710-AR2 sensors can be stacked vertically:

Maximum stacked height: Up to 19.5"
Gap between sensors: 1/16" to 1/8"
Bottom sensor: Cut the 2/GRY and 3/BLK tabs
Top sensor: Cut the 2/GRY, 3/BLK, and TOP tabs
Equal length recommended: Cut both sensors to approximately equal length

💡 When to Stack vs. Use Larger Sensor

For tanks 10" to 14" tall, you have options:

Option A: Stack two 710-AR2 sensors (maintains 0.25" resolution)
Option B: Use a single 710-ES3 (simpler install, 0.33" resolution)

Stacking maintains the AR2's superior resolution but requires more effort. For most users, a single 710-ES3 is simpler for mid-height tanks.

🚫 Do NOT Mix Sensor Types When Stacking

If you stack two sensors, they must be the same model. Do not mix a 710-AR2 with a 710-ES3 or 710-SS2. Each sensor type has different segment spacing and communication protocols.

Note: Previous model senders (710-JS, 710-ES, 710-ES2, 710-SS) CAN be combined with new sender models for replacement purposes.

Compatible SeeLevel Monitors

The 710-AR2 works with all SeeLevel II monitors:

709 Series – All models (709-P3, 709-P4, 709-RVC, 709-BTP7, etc.)
714 Series – All models
709-N2K – NMEA 2000 compatible models
SeeLevel Soul – Factory-installed systems (up to 7 tanks)

Note: On 4-tank monitor models (709-P4), the gray and galley tanks can only have one sender each (no stacking).

Installation Overview

Install display first – mount the SeeLevel monitor inside the RV
Measure tank height – determine the "measurable space"
Cut sensor to length – trim in 1" increments if needed (minimum 3")
Program the sensor – cut the appropriate tabs to identify tank type
Clean tank surface – remove all dust, grease, and residue with acetone or rubbing alcohol
Test before adhering – temporarily tape sensor in place and verify operation
Permanently mount – peel backing and press firmly onto tank
Wire to monitor – connect blue (signal) and black (ground) wires

🔧 Installation Tips

• Position sensor 1/4" to 3/4" from tank top and bottom – accounts for tank wall thickness
• Keep metal at least 1" away – metal near the sensor affects readings
• Route wires to the RIGHT – never route wires across or left of the sensor
• Avoid air gaps – sensor must fully contact tank surface
• Test BEFORE permanent adhesion – verify readings while taped in place

⚠️ Fresh Tank Tip

On fresh water tanks, the outlet for the pump feed may sit more than 1 inch above the tank bottom. Your water pump may begin sucking air before the tank reads "empty." In these cases, install the sensor above the outlet for the pump feed so the monitor reads "0" before the pump sucks air.

Why Choose the 710-AR2?

The 710-AR2 is the ideal choice when:

Your tanks are under 10.5" tall – maximum segments for best accuracy
You want the highest possible resolution – 0.25" is the finest available
You have low-profile/shallow tanks – designed for space-constrained installations
You're replacing an older 710-AR sensor – the AR2 is the updated version

🚫 Plastic Tanks Only – NOT for Metal

SeeLevel sensors use capacitive technology to sense through plastic tank walls. They will NOT work with metal tanks (stainless steel, aluminum). The vast majority of RV holding tanks are roto-cast polyethylene plastic.

Specifications

Brand	Garnet Instruments
Model	710-AR2
Replaces	710-AR (older version)
Type	External Tank Sensor Board
System	SeeLevel II
Warranty	1 Year Limited

Dimensions

Sensor Height	9.15 inches (not including tabs)
Sensor Width	2.20 inches
Thickness	0.008" (glass epoxy)
Wire Lead Length	10-1/2 inches

Tank Height Range

Single Sensor – Ideal	3.5" to 10.5"
Single Sensor – Min	3" (after cutting)
Double-Stacked	Up to 19.5"
Minimum Cut Length	3" (DO NOT cut shorter)
Cut Increments	1" segments

Performance

Resolution	0.25" (6mm) – HIGHEST
Accuracy	±8% or better
Max Tank Wall Thickness	3/8" (10mm)
Operating Temp	+32°F to +140°F

Construction

Material	Flexible Glass Epoxy
Circuit Protection	Conformal Coating
Adhesive	3M 300LSE Bonding
Wire Connection	2-wire (signal + ground)

Compatibility

Tank Type	Plastic/Polyethylene Only
NOT Compatible	Metal Tanks
Monitors	All 709 & 714 Series
Bus Topology	Common 2-wire bus

Compatible Monitors

709-P3 (3 tank)
709-P4 (4 tank)*
709-RVC (RV-C compatible)
709-BTP7 (Bluetooth, 7 tank)
709-N2K (NMEA 2000)
714 Series (all models)
SeeLevel Soul (factory systems)

*On 4-tank models, gray and galley tanks can only have one sender (no stacking).

What's Included

One (1) 710-AR2 Sensor Board
Pre-attached wire leads (10-1/2")
3M 300LSE adhesive backing

What's NOT Included

SeeLevel Monitor/Display
Wiring harness/cables
Additional sensors

Sold

Individually – one sensor per package. Order one sensor per tank (or two if double-stacking).

Wire Colors

Blue Wire	Signal (to monitor)
Black Wire	Ground

Resolution Comparison

710-AR2 (This)	0.25" (6mm) – BEST
710-ES3	0.33" (8mm)
710-SS2	0.44" (11mm)

Higher resolution = more sensing segments = more accurate readings on short tanks.

710-AR2 vs 710-AR

The 710-AR2 is the updated version of the original 710-AR. Both are compatible with all SeeLevel II monitors. If you're replacing an older 710-AR sensor, the 710-AR2 is the correct replacement.

Previous model senders (710-JS, 710-ES, 710-ES2, 710-SS) can be combined with new sender models.

Measurable Space Calculation

Single sensor formula:
Measurable Space = Tank Height - 1/4" (top) - 1/4" (bottom)
Round down to nearest 1"

Stacked sensors formula:
Measurable Space = Tank Height - 1/4" - 1/4" - 1/8" (gap)
Round down to nearest 1"
Divide equally between top and bottom sensors

Tools Required

Wire cutters/stripper
Wire crimper
Sharp scissors or hole punch
Acetone or rubbing alcohol
Tape (for testing)

Manufacturer

Garnet Instruments Ltd.
Sherwood Park, Alberta, Canada
Garnet US Inc.
Granbury, TX USA

Website: garnetinstruments.com