The OS-1 with Magnetic Mount can be used on your Apex Controller by Neptune Systems or with the ATK automatic top off kit.  The OS-1-M can be easily mounted to your sump or aquarium to control the water level with the...

Neptune Conductivity Calibration Fluid 53,000 Conductivity solution is used to calibrate your conductivity probe for your specific gravity (SG).  Using the solution will make sure you probe is accurate when using your...

This is the calibration solution for calibrating PH probes for controllers and handhelds.  If your PH probe is inaccurate calibration solution will calibrate it to 7.01 and 10.01 to make your readings and test results...

The FS-100 is a flow sensor for the FMM and is a 1" size with unions for using the flow monitoring system with your Apex controller by Neptune Systems.  You will need also the FMM module, power supply, and other...

This 24VDC powered, normally-closed (NC), solenoid valve has push-fit tubing input and outputs designed for standard 1/4″ tubing. The electrical connection on this solenoid valve fits the DC24 accessory ports found on...

There are many useful purposes for water-level sensors on an aquarium. They can help you build an auto-top-off, monitor the levels in your supplement containers, even help automate saltwater mixing containers. Traditionally...

Neptune Probe Module PM1 is for PH, ORP, and Temperature. Apex PM1 module by Neptune Systems is designed to control or add PH, ORP, or Temperature probes to your Apex controller. Monitor/Control pH or ORP, and temperature...

The Neptune DOS to 1LINK cable allows you to not have to use a power cord or aquabus cable and is the only cable you will need to connect and control your DOS pump via a 1Link module.  Its a 4 pin connector that...

Neptune Apex ALD Advanced Leak Detection Probes can save you a lot of money by preventing your aquarium from flooding your house in case of a leak. Finally, an easy to use way to detect water on the floor! The long-awaited...

The FS-25 is a flow sensor for the FMM and is a 1/4" size with unions for using the flow monitoring system with your Apex controller by Neptune Systems.  You will need also the FMM module, power supply, and other...

LDK or Leak Detection Kit is everything you need to know if you have a leak on your aquarium system.  You can use your APEX controller with the LDK and have it monitor your tank 24/7, using two leak detection probes...

The FS-200 is a flow sensor for the FMM and is a 2" size with unions for using the flow monitoring system with your Apex controller by Neptune Systems.  You will need also the FMM module, power supply, and other...

Lunar Simulator Module (LSM) Moonlights for Apex Systems. Neptune Systems Apex LSM module is designed to simulate moonlight and the lunar cycle on your saltwater aquarium. Want to more accurately simulate the natural...

The PM2 probe module includes support for conductivity (salinity), temperature, and 6 digital inputs. Apex PM2 module features are: Monitor/Control Conductivity/Salinity and temperature. 4 Measurement ranges (0-900 uS/cm,...

Neptune Systems DOS Pump Tubing is designed to be used with the add on DOS dosing pump.  It will ensure that the fittings do not draw air into the tubing. The DOS tubing for the Apex module is sold in 2 different...

The FS-50 is a flow sensor for the FMM and is a 1/2" size with unions for using the flow monitoring system with your Apex controller by Neptune Systems.  You will need also the FMM module, power supply, and other...

The second cable is for the DIY folks out there. This cable connects to the 24VDC accessory connections on the 1LINK. This cable has two bare (tinned) wires on the other end so you could connect it up to a 24VDC device of...

This 24VDC, 36W power supply is used with the FMM so that you can attach the powered accessories above like the PMUP or the Solenoid Valve. This power supply is for 110V USA-style  outlets.

This PH 4.01 is the calibration solution and fluid for calibrating PH probes for controllers and handhelds.  If your PH probe is inaccurate calibration solution will calibrate it to 4.01 and to make your readings and...

Neptune Systems 1LINK Module will be used for connecting Apex controllers to the WAV pumps.