How to test for stray voltage in an Aquarium

If you’ve ever wondered how to test for stray voltage in an aquarium, well wonder no longer. We’ve got the answers for you.

All you need is a Multi-meter to do the test. Along with your Aquarium that uses electrical devices such as pumps, filters, or heaters. You can watch the video or read below for basic instructions. The test data from the video is posted below as well.

To perform the test set your Multi-meter to VAC (AC Voltage), then place one test lead tip in the water and the other into one side of the electrical outlet that powers your tank. It will show you the reading of all items in total. To see what each item puts out plug them in one at a time, see the video above for a demonstration.

Results of tests performed in the video.

  • Penn Plax Cascade 600 Internal Filter – 46.8 Volts
  • Marineland Stealth Heater 200 Watt – Fluctuated, ended around 7 Volts
  • Marineland Stealth Heater 250 Watt – Spiked high then settled at 13.2 Volts
  • Marineland 550 Powerhead – 7.5 Volts
  • Hydor Mini Heater 7.5 watt – 3.8 Volts
  • Hydor Theo Heater 400 Watt – 18.3 & 17.7 Volts ( I tested two)
  • ViaAqua 2600 Pump 45.5 watt – 5.1 Volts


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