Mastertronic Automated Water Tester

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The Mastertronic is the latest addition to Focustronic's suite of water testing equipment. It is a standalone machine with the ability to accurately measure Nitrates, Phosphates, Magnesium, Calcium, Alkalinity, and organic matter in aquariums.

  • Automatically measures and records important water parameters
  • High precision stepper and DC pumps
  • State-of-the-art colorimetric photosensor
  • Easy-to-use iOS and Android App
  • WiFi connectivity
  • Communicates with Alkatronic, Dosetronic, Solartronic, and Powertronic


* Test Kit Reagents Sold Separately

** iOS or Android App Required for use (Android requires Bluetooth 4.2 or above)




  • Dimensions: 13"L x 8.9"W x 13.6"H
  • Accuracy / Precision (+/-)
    • NO3: 0.5 ppm / 0.1 ppm
    • PO4: 0.01 ppm / 0.005 ppm
    • Mg: 20 ppm / 20 ppm
    • Ca: 6 ppm / 6 ppm
    • dKH: 0.1 dKH / 0.05 dKH
  • Connectivity: Cloud, App
  • Software: iOS app, Android app, wifi based
  • Standalone: Yes
  • Dosetronic Compatible: Yes. Wireless communication with Dosetronic making it possible to alter the schedules in Dosetronic in desired channels based on measurements from Mastertronic.
  • Socket Communication: Yes. Wireless communication with Focustronics sockets, making it possible to control socket on-off based on measurements from Mastertronic.



Compatible Test Kits
Nitrite Fauna Marine (NO2/NO3), Tropic Marin
Nitrate Fauna Marine (NO2/NO3), Tropic Marin
Phospate Red Sea Pro
Calcium API, API Low Range
Magnesium Red Sea Pro, Giesemann, Giesemann Low Range, Colombo, Colombo Low Range
Iodine Giesemann, Colombo
Ammonia JBL
Iron JBL
Alkalinity Salifert



What's Included?
3x External hoses (2 meters in length each)
1x Needle stabilizer
1x AC/DC adapter
2x Microfilter
2x Magnetic stirring bars
Needles and syringes

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Product Questions

Does the Mastertronic REQUIRE RODI water to work properly, or could it work properly without it?
Question by: Michael on Aug 4, 2022, 1:15 AM
That is a good question. The Mastertronic is a stand alone testing unit that would test water from the aquarium. It does require some RO/DI water for this process. it is preferred and recommended that seawater be made with high quality RO/DI water for optimum success and reduced issues with unknown water sources. Many municipalities treat water with things that are not good for an aquarium environment and can also skew test results when used instead of purified water.
Answer by: Rick Pucciarella (BRS Staff) on Aug 4, 2022, 12:18 PM
How long is the power cord on the Mastertronic?
Question by: Stian on May 8, 2022, 11:40 PM
Answer by: Scott F. (BRS Staff) on May 10, 2022, 1:01 PM