Best in 7 days
![Blue Sea 1839 M2 OLED Tank Monitor [1839]](https://cdn.shopify.com/s/files/1/0405/8454/4408/products/64341XL.jpg?v=1591322113 "Blue Sea 1839 M2 OLED Tank Monitor [1839]")
Pay in installments of $35.88 with
,
and
Shipping Estimate
USA
- USA
- CAN
- USA
- CAN
Ships within 48 hours · Estimated delivery Jun 12 - Jun 17
Promo Codes Available:
For Your Every Summer RSVP, with Code: SUMMER15
Description
Blue Sea 1839 M2 OLED Tank Monitor [1839]M2 OLED Tank Monitor The M2 Organic LED Digital Monitor measures essential electrical system parameters with adjustable alarms and an auto dimming display. The M2 Monitors include a MOSFET External Circuit Relay (ECR) which can be used to control external circuits based on any value measured by the M2. Features: Auto dimming, bright Organic LED display is easy to read 80dB alarm on all models Isolated 500mA MOSFET relay Includes external DC Shunt or
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
Discover Niche Categories That Outsell
Top-Converting Item to Boost Your Average Order
Best in 7 days
Best in 7 days
Best in 7 days
![Blue Sea 1821 Universal Temperature Sensor [1821]](https://cdn.shopify.com/s/files/1/0405/8454/4408/products/64340XL.jpg?v=1591322104 "Blue Sea 1821 Universal Temperature Sensor [1821]")
Best in 7 days
4.8 ★★★★★
Based on 2184 reviews
Sort
Product Reviews
★★★★★ 5
Made well and great fit
Fits perfectly and is made well
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 8, 2026
★★★★★ 5
Make sure you know the size
Yes worked like a charm
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 5, 2026
★★★★★ 5
Great fitment, made changing the oil filter easy
Perfect fit for my m760i oil filter housing.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 24, 2026
★★★★★ 5
s tier quality
superior quality, single cast aluminum 👍
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 2, 2026
★★★★★ 4
Too Tight but It Works
It doesn't really sit on very well to be honest, it tends to sit TOO tight in my opinion. Taking it off can be a hassle but at least it gets the job done, durability is good, finish is great, obviously easy to use.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 28, 2025
