Finnex Digital Aquarium Controller HC-820W Series

The HC-820W controller uses an advanced digital processor that monitors and controls the water temperature in your aquarium. The heating controller receives temperature data from the remote sensor in the aquarium. The remote sensor contains no bi-metallic contacts to arc, corrode or wear out. This allows the HC-820W to have precise control, keeping the water temperature stable while avoiding wide temperature swings common with low-quality aquarium controllers. The controller displays the current temperature, allowing you to easily make temperature adjustments on the front panel. Temperature can be adjusted by a tenth of a degree.

Unlike the HC-820M, the HC-820W works it's magic in ALL types of water.