The A3 Apex Jr. is your affordable entry point into smart aquarium monitoring. Designed for aquarists who want reliable, essential monitoring without the complexity, the Apex Jr. continuously tracks temperature, pH, water levels, and leaks, keeping your tank and home safe. With built-in WiFi, remote access via Apex Fusion, and customizable alerts, you’ll enjoy peace of mind knowing your aquarium is always under watch — no matter where you are.
Expandable and future-ready, the Apex Jr. grows with your hobby. Add additional modules for salinity, dosing control, lighting, pumps, and more, tailoring your monitoring system as your aquarium evolves.
Essential Monitoring – Tracks temperature, pH, water level, and potential leaks.
Instant Notifications – Alerts you when parameters fall outside your safe zones.
Expandable System – Add Apex modules and accessories over time (e.g., salinity probes, power bar control, dosers).
Built-in WiFi & Remote Access – Monitor and control your aquarium anytime, anywhere with Apex Fusion.
Apex Fusion App – Free, cloud-based platform with drag-and-drop customization, task automation, and real-time graphing.
Peace of Mind – Early warnings help prevent disasters, save money, and reduce stress.
Base Connectivity: 2x AquaBus ports for expansion
Included Monitoring: Temperature, pH, water level (MOS sensor), leak detection (LD-2 sensor)
Alerts: Configurable notifications via Apex Fusion
Mounting: Wall-mountable base unit
Remote Access: Supported on computer, tablet, or smartphone via Apex Fusion
1x A3 Apex Jr. Base Unit
1x Power Supply
1x Temperature Probe
1x pH Probe
1x MOS Magnetic Optical Sensor (water level)
1x LD-2 Leak Detection Sensor
1x Calibration Solution Pack (7 & 10)
Mounting Screws
Quick Start Guide