A3 Apex Jr Aquarium Controller System
The A3 Apex Jr Aquarium Controller System from Neptune is a smart, compact solution designed to monitor and manage key parameters in your aquarium. It provides real-time tracking of water temperature, pH, and dissolved oxygen levels, helping maintain a healthy environment for your fish.
Key Features
- Real-time monitoring of temperature, pH, and dissolved oxygen
- Bluetooth connectivity for smartphone app integration
- LED status indicators for easy visual feedback
- Adjustable alarm thresholds for safety alerts
- Power supply via USB-C, compatible with standard aquarium power sources
Specifications
| Parameter | Value |
|---|---|
| Water Temperature Range | 5°C to 35°C |
| pH Range | 5.5 to 9.0 |
| Dissolved Oxygen Range | 0 to 15 mg/L |
| Battery Life | Up to 12 months (with regular use) |
| Connectivity | Bluetooth 5.0 |
FAQ
Can the A3 Apex Jr control water pumps or filters automatically?
No, the A3 Apex Jr only monitors water parameters. It does not have built-in automation for pumps or filters.
How often does the device need to be calibrated?
The device does not require manual calibration. It provides accurate readings with regular use.
Is the device compatible with all aquarium types?
The A3 Apex Jr is compatible with freshwater aquariums. It is not designed for saltwater or reef systems.

Bella Rees –
The A3 Apex Jr has made it easy to keep track of my tank’s water conditions. I can see temperature and pH changes in real time on my phone. The setup was simple and the alerts are helpful when levels go out of range. Great for a beginner aquarist.
Sonia Bond –
I use this with my 10-gallon freshwater tank. The device is compact and doesn’t take up much space. The app interface is clean and shows data clearly. I noticed a slight delay in oxygen readings, but overall it’s reliable.
Justin Powell –
After a few weeks of use, I feel more confident in maintaining stable water conditions. The alarms help me catch fluctuations early. It’s a small but useful tool for daily aquarium care.