Automated Water Testing. Smarter Decisions. A More Stable Reef.

Take reef automation to the next level with the Focustronic Mastertronic, an advanced automatic water testing system that continuously measures critical water parameters and provides the data needed to maintain a thriving reef aquarium. Designed for serious hobbyists, the Mastertronic helps eliminate manual testing while giving you valuable insight into your aquarium's chemistry. Watch the product video below to see the Mastertronic in action.

Product Description

The Focustronic Mastertronic is a fully automated water testing system capable of monitoring multiple critical reef parameters without the need for manual testing.

Using a precision colorimetric testing system combined with high-precision pumps and intelligent automation, the Mastertronic performs scheduled tests, records historical data, and communicates seamlessly with other Focustronic equipment.

When paired with the Alkatronic and Dosetronic, the Mastertronic becomes part of a fully automated reef ecosystem capable of monitoring water chemistry and adjusting dosing automatically to help maintain long-term stability.

Key Features

Automated Multi-Parameter Testing

Automatically tests important reef parameters including:

• Nitrate (NO₃)
• Phosphate (PO₄)
• Calcium (Ca)
• Magnesium (Mg)
• Alkalinity (dKH)
• OLI (Organic Load Index)

Future parameter support may be added through software updates.

High-Precision Colorimetric Testing

The Mastertronic combines precision pumps with a state-of-the-art colorimetric photosensor to provide accurate, repeatable test results.

Typical accuracy includes:

• Calcium: ±6 ppm
• Magnesium: ±20 ppm
• Nitrate: ±0.5 ppm
• Phosphate: ±0.01 ppm
• Alkalinity: ±0.1 dKH

Fully Automated Scheduling

Schedule tests throughout the day and review historical trends from anywhere using the Focustronic App.

Receive alerts and notifications whenever parameters fall outside your desired range.

Smart Wi-Fi Connectivity

Control the Mastertronic through the Focustronic All-In-One App.

Features include:

• Remote monitoring
• Historical charts
• Test scheduling
• Notifications
• Automatic firmware updates
• Cloud connectivity

Complete Focustronic Integration

Communicates with:

• Alkatronic
• Dosetronic
• Powertronic
• Solartronic

Together these devices create one of the most advanced reef automation ecosystems available.

Why Choose the Mastertronic?

Unlike single-parameter testers, the Mastertronic provides automated testing for multiple critical reef parameters using widely available third-party test kits.

This allows reef keepers to spend less time performing manual tests while gaining more frequent and consistent data to make better decisions for their aquarium.

For hobbyists seeking the highest level of automation, pairing the Mastertronic with the Alkatronic and Dosetronic creates a complete monitoring and dosing solution capable of maintaining exceptional reef stability.

Specifications

Brand: Focustronic

Model: Mastertronic

Aquarium Type: Saltwater / Reef

Testing Method: Automated Colorimetric Analysis

Measures:

• Nitrate
• Phosphate
• Calcium
• Magnesium
• Alkalinity
• Organic Load Index (OLI)

Connectivity:

• Wi-Fi
• Cloud
• Mobile App

Dimensions:

Approximately 13" × 8.9" × 13.6"

Compatible Test Kits

Supports a variety of popular third-party test kits, including compatible options from:

• Red Sea
• Salifert
• API
• Fauna Marin
• Tropic Marin
• Giesemann
• JBL
• Colombo

Compatibility varies by parameter.

What's Included

• Mastertronic Automated Water Tester
• Power Supply
• Tubing & Connections
• Setup Accessories
• Quick Start Documentation

Test kit reagents sold separately.

Shipping

This product ships using our Large Shipping service for a flat $45.99 anywhere within the contiguous United States.

Orders are typically processed within 1–3 business days, excluding weekends and holidays. Tracking information will be emailed once your order ships.

Due to the size, value, and precision of this equipment, it may ship separately from other items in your order to help ensure safe delivery.

Why Buy From Infinity and Beyond Aquatics?

At Infinity and Beyond Aquatics, we believe consistency is the key to a successful reef aquarium. That's why we offer advanced automation equipment from trusted brands like Focustronic, helping hobbyists reduce manual maintenance while improving water quality and long-term stability.

Whether you're building a fully automated SPS system or simply looking to eliminate repetitive testing, we're here to help you choose equipment that delivers professional-level performance.