Mon-Thurs 7am-5pm PST
Fri 7am-4pm PST

Questions about products, orders, shipping?
Contact us by call or email

Neptune Apex FMM Leak Detection Probe - Solid Surface (LD-2)


Item #: NS17195

In Stock

Plug this probe into your FMM and then place it on any surface where you want to detect stray water. Upon contact with water this probe will communicate to your Apex and alerts or other actions can then take place. Time is so critical when it comes to water on the floor so it is very common to place two LD-2 inside the stand and two LD-1 outside the stand under a carpet to have the ultimate protection against a leaky aquarium.

Note: The LD-2 will only work with the FMM or be used as an addon probe for the LDK. The LD-2 cannot be used with the ALD module.

Manufacturer information

Neptune Systems Aquarium Supplies
Neptune Systems is one of the world’s leading manufacturers of aquarium controllers. The company was founded in 1995 for the purpose of developing affordable water quality monitoring and control instrumentation. Their engineering team has extensive expertise in computer hardware and software system design as well as a background in water quality analysis. Neptune Systems uses these finely-honed engineering skills to develop innovative monitoring and control solutions for use in reef and fresh water aquariums, aquaculture tanks, hydroponics systems and general laboratory use. Neptune Systems is best known for their AquaController line. The company is known for their innovation and customer centricity.

5 Stars


Reviewed on
August 08, 2019

Yes, I would recommend this.

Great product

Pros: Easy to install

Cons: None

Love it now I dont have to worry to much or I can go on vacation without worrying to much of a leak this product will detect it love it

Was this review helpful? 0 0


Reviewed on
April 28, 2019

Yes, I would recommend this.

good however rust forms if it gets wet

Pros: easy setup and quick response

Cons: must keep paper towel under unit to keep dry from humidity

Good unit, very sensitive, however once it gets wet on probes you should look to replace.

Was this review helpful? 0 0


Reviewed on
September 19, 2017

Yes, I would recommend this.

It works!

Pros: N/A

Cons: N/A

Tested it. It works great. Peace of mind.

Was this review helpful? 0 0


Reviewed on
May 14, 2017

Yes, I would recommend this.

Peace of mind for a good price

Pros: Awesome sensor!

Cons: None

I purchased this add-on to my Neptune Apex Classic system to make sure that, if either my 210 gallon reef tank or the 65-gallon sump underneath it overflows (both are located in my basement), it will both alert me and shut off the main pump. Since I am away from home quite a bit, this sensor provides me with peace of mind that I can be away for several days and not have to worry about coming home to a flooded basement and lots of dead livestock.

Was this review helpful? 0 0


Reviewed on
March 17, 2017

No, I would not recommend this.

perfect for cabinet

Pros: great product update

I have two of these, one on each end of my sump cabinet.

Was this review helpful? 0 0

We use cookies to provide a personalized site experience. By continuing to use & browse this site, you agree to our Privacy Policy.