Defender Home Page
Phone: 800-628-8225 Fax: 800-654-1616 Int'l.: 860-701-3400 Email: Contact Us
Follow us on Facebook
Shipping Info
Defender Home Page
Your Cart
null View Cart View Shopping Cart
null Check My Order(s)
null Track My Package(s)
Conversion Chart
Shopping Areas
Boats & Motors
null Defender Seal null
promo A
promo B
promo C
promo D
Blue Sea Systems M2 OLED (Organic LED) Digital Temperature Monitor

Blue Sea Systems M2 OLED (Organic LED) Digital Temperature Monitor

  • Function: Monitor up to 4 Temperature Sensors
  • Input Voltage: 7-70 Volt DC, Temp Range: -40° F - 250° F
  • Waterproof: IP66, Easy to Read, Auto-Dimming, Bright LED Display
  • Item #: 
    Blue Sea Systems
    Model #: 


    Shipping Weight: 
    4.00 Lbs.
    List Price: 
    Our Price:
    Status:   null Call to confirm

    Quantity : 


    Package includes:

    • M2 Organic OLED Digital Temperature Monitor
    • (2) 1820 Submersible Temperature Sensor
    • (2) 1821 High Temp Temperature Sensor


    • The Blue Sea Systems M2 OLED (Organic LED) Digital Temperature Monitor measures essential parameters with adjustable alarms and an auto-dimming display
    • The M2 Monitors include an Isolated 500mA MOSFET* External Circuit Relay (ECR)
      • Used to control external circuits based on any value measured by the M2
    • Auto-dimming, bright Organic LED display is easy to read 80dB alarm on all models
    • Isolated 500mA MOSFET relay
    • Includes external DC Shunt or AC Current Transformer when required
    • Versatile external temperature monitoring
    • Monitor up to (4) temperature sensors
    • Temperatures range from -40° C to 120° C (-40° F to 250° F)
    • Measures in Fahrenheit or Celsius
    • ABYC compliant for engine exhaust
    • Waterproof temperature sensors included

    *MOSFET Relay: Metal–Oxide–Semiconductor Field-Effect Transistor is a type of field-effect transistor (FET). It includes an insulated gate that provides the ability to amplify or switch electronic signals by changing the amount of applied voltage.

    Click Here for an Owner's Manual for this Product

    Click Here for an Installation Guide for this Product


    • Meter Type: Temperature
    • Function: Monitors Temperature
      • Sensor Locations: Up to (4)
    • Alarm / Relay Activation: High and Low Temperature
    • Display Size: 55 mm x 28 mm
    • Input Voltage: 7-70 Volt DC [Variable with voltage, display intensity, and sleep mode]
    • Range: 0.3 Watt - 1.0 Watt
    • Temperature Range: -40° C – 120° C (-40° F – 250° F)
    • Includes (2) Blue Sea 1821 Temp Sensors:
      • Non-submersible IP65 (Protected against jets of water)
      • Designed for sensing raw water exhaust without drilling holes
      • Strap sensor to the outside of the pipe for accurate readings of raw water exhaust temperature
      • Multiple mounting options
      • Wires connect in either order
      • Applications: Blue Sea Systems products that require a temperature sensor
      • Wire Length 18" (45.72 cm)
      • Wire Size 16 AWG
    • Includes (2) Blue Sea 1820 Temp Sensors:
      • Fully Submersible (IP68) Temperature Sensor
      • General temperature sensor designed to work for most applications
      • Easy double sided tape instillation
      • Wires connect in either order
      • See specific product manual for wiring instructions
      • Applications: Blue Sea Systems products that require a temperature sensor
      • Resistance 10,000 Ohms @ 25° C
      • Temperature Range -40° F to 175° F (-40° C to 80° C)
      • Wire Length 12" (30.48 cm)
      • Wire Size 16 AWG
    CA Prop65 warning

    Blue Sea Systems M2 OLED (Organic LED) Digital Bilge Meter
    Item #: 205043
  • Function: Monitors bilge pump activity in up to (4) Bilges
  • Input Voltage: 7-70 Volt DC, Range: 0.3 Watt-1.0 Watt
  • Waterproof: IP66, Easy to Read, Auto-Dimming, Bright LED Display
  •  Include
    Model #:
    Blue Sea Systems High Temp Temperature Sensor
    Item #: 205033
  • Temperature Range: -40° F to 300° F (-40° C to 150° C)
  • Wire Size: 16 AWG, Wire Length: 18 in (45.72 cm)
  • Applications: All Blue Sea Systems Products that Require a Temp Sensor
  •  Include
    Model #:
    Blue Sea Systems M2 OLED (Organic LED) Digital Tank Monitor
    Item #: 205034
  • Function: Monitors Levels in up to (4) Water or Holding Tanks - with Alerts
  • Power: 12/24/32 Volt DC, Compatible with Common Sending Units (Not Included)
  • Cutout: 2-1/8" (54 mm) Diameter
  •  Include
    Model #:

    Have A Suggestion?

    Help us make our site better for everyone! Let us know you've found something wrong or frustrating on this page and we will improve it. Please mark each that apply.

    Product has been improperly categorized
    Page loads too slowly
    Product information is incorrect
    Page has errors or bugs
    Site is frustrating or difficult to use
    Product image is missing or wrong
    Cannot find my size
    Spelling errors on page
    Not enough product information

    Comments or Examples:
    Examples: Missing information such as dimensions and model number, typos, inaccuracies, etc...

    Please include your e-mail address below if you would like us to respond to your comments or questions.             

    Join Our Email List And Receive our Monthly Promotions
    Defender Email Specials
    Click Here For Our Privacy Policy