Combo Finnex 300W titanium hting tube and HC-0820M control FX 820M-TH300S

Finnex HC-0820M Digital Controller

Finnex 300W Deluxe Titanium Hting Tube

The HC-820M Controller monitor and controls the water temperature in the aquarium.

Titanium Hting Tube has an internal sensor that detects when the hter tube is exposed to the air.