Upgrade or safeguard your aquarium system with the A3 Apex Pro Base Unit (Replacement).
This package includes the A3 Pro base unit plus calibration solutions for pH (7 & 10) and salinity (53,000).
Perfect for:
- Upgrading from an older A1 Classic or A2–A3 base unit that’s out of warranty
- Keeping a spare on hand for peace of mind—because Murphy’s Law happens
Stay prepared and keep your system running smoothly with a reliable backup.
