Mastertronic Essential Automated Water Tester (Alk/Cal/Mag/PO4/NO3)

Automate Your Nitrate, Phosphate, Calcium, Alkalinity, and Magnesium Dosing

• Automates Testing of 5 Essential Parameters + OLI
• Eliminates the Need for Multiple Test Devices
• High Precision Stepper and DC Pumps
• State-of-the-art Colorimetric Photosensor
• App Control for Test Scheduling & Trend Tracking
• Stand-Alone Device: No Central Controller Needed

The Mastertronic Essential is a fully automated water testing device designed to measure the five most critical parameters in your reef tank: alkalinity (dKH), calcium, magnesium, nitrate, and phosphate. This all-in-one tester replaces the need for multiple test kits or separate automated units, saving you valuable cabinet space and cutting down on maintenance.

Using high-precision colorimetric testing, the Mastertronic Essential delivers reliable results you can trust.

Focustronic All in One App (AIO)

Control and monitor your Mastertronic Essential wirelessly using the Focustronic AIO app, available for iOS and Android. The app provides a clean, intuitive interface with individual pages for each parameter, making it easy to track test results, view trends, and make informed adjustments to your reef system.

Schedule Your Tests

Set up testing schedules tailored to your reef’s needs with just a few taps. Each parameter can be tested on its own schedule, giving you full control over frequency and timing. When connected to compatible Focustronic devices like Dosetronic, Powertronic, or Solartronic, you can automate dosing, power adjustments, and lighting changes based on test results. Simple to use and built for advanced integration, scheduling is both flexible and powerful.

OLI Testing

OLI, or Organic Level Index, is a unique feature developed by Focustronic and available exclusively on the Mastertronic series. It measures the yellowness of your aquarium water, providing insight into the organic load in your system.

A rising OLI value can indicate the need for routine maintenance, such as a water change or fresh activated carbon. By tracking this trend over time, you can stay ahead of potential water quality issues before they impact your livestock.

Compatible 3rd Party Test Kits 

Nitrate (NO3): API Nitrate Test Kit

Phosphate (PO4): Red Sea Phosphate Pro

Calcium: API Calcium Test Kit

Magnesium: Red Sea Magnesium Pro

Alkalinity: Red Sea Alkalinity Pro

Note: Test Kit Reagents Sold Separately

Specifications

• Dimensions: 12.40"L x 8.86"W x 13.78"H
• Software: iOS app, Android app, WiFi based
• Standalone: Yes
• Communication: Local WiFi b
• Accuracy
  • Nitrate: +/- 0.5 ppm
  • Phosphate: +/- 0.01 ppm
  • Alkalinity: +/- 0.1 dKH
  • Magnesium: +/- 16 ppm
• Approximate time to do one test
  • Nitrate: 30 minutes
  • Phosphate: 20 minutes
  • Calcium: 12 minutes
  • Alkalinity: 8 minutes
  • Magnesium: 12 minutes

What's Included?

Mastertronic Essential Automated Testing Device

Note: Test Kit Reagents Sold Separately