Neptune Systems A3 Apex Jr System

Essential Monitoring Made Simple

• Temperature, pH & water level tracking

• Leak Detection Sensor included

• Expandable with additional Apex modules

• Built-in Wi-Fi with Apex Fusion remote access

• Instant notifications if parameters drift outside safe zones

Why Do You Need an Aquarium Monitor?

A monitor acts as your tank’s early warning system — your second set of eyes. By constantly checking temperature, pH, water level and detecting leaks, it helps you:

• Prevent disasters: Get alerted before small problems become big ones

• Save time & money: Reduce manual testing and catch issues before they cause damage

• Gain peace of mind: Receive real-time alerts even when you’re not home

Why Choose the A3 Apex Jr for Your Aquarium?

The A3 Apex Jr is a cost-effective, entry-level solution for aquarists wanting essential, worry-free monitoring. It keeps tabs on:

• Temperature

• pH

• Water levels

• Potential leaks

And while it’s simple to start with, it’s expandable. Use the two AquaBus ports to connect additional Neptune modules as your reef setup grows:

• Want salinity monitoring? Add a PM2 Module with Conductivity Probe

• Want full gear control? Add the EB832 Power Bar for pumps, lights & more

Control From Anywhere with Apex Fusion

Apex Fusion is a free, cloud-based platform that connects you to your aquarium from anywhere in the world. Features include:

• Drag-and-drop custom dashboards

• Easy setup tasks for new gear

• Instant alerts for critical changes

• Full control from your mobile or desktop

What’s Included with the A3 Apex Jr?

A3 Apex Jr Base Unit
The brain of the system, with two AquaBus ports for easy future expansion.

Temperature Probe
Sends instant alerts if your tank temperature moves outside your set range. Early detection of heater issues is critical.

pH Probe
Perfect for reef keepers dosing two-part or kalkwasser. Quickly catch dosing pump issues or overdoses.

Magnetic Optical Sensor (MOS)
A compact water level sensor ideal for sump or dosing containers. Mounts on surfaces up to 6mm thick.

LD-2 Leak Detection Sensor
Place it in your cabinet or around high-risk areas. Get notified the moment water is detected.

What’s in the Box?

• A3 Apex Jr Base Unit

• Power Supply (with AU plug)

• Temperature Probe

• pH Probe

• MOS Magnetic Optical Sensor

• LD-2 Leak Detection Sensor

• Calibration Solutions (pH 7.0 & 10.0)

• Mounting Screws

• Quick Start Guide

  🇦🇺 Distributed in Australia – Includes AU plug and full local support.