HC-820M & HC-820W Series Overview 1000 Watt Max Output Load with Dual Relay Protection 1/10th Degree Temperature Calibration 3 Digit Digital Display & Control Over Heating Audio Alert Temperature Saving Memory Protection ± .5°F High Precision Accuracy Temperature Steady Low Variance Technology The HC-820M & 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 controllers 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. Audio Alert only on the HC-820M: The remote sensor also functions as an automatic power cut-off switch. If the water level drops too low and exposes the temperature sensor to the air, power to the heater tube is turned off. This prevents over-heating of the aquarium, saving your prized aquarium life from harm or other hazards. This feature only works on Saltwater Aquariums and in water parameters of 150 TDS and above. Outside of the noted, users should opt for the HC-820W instead. Model Voltage Control Range Accuracy Control Max Load Sensor Cord Power Cord Application HC-820W 110-120V 49.9F-94F ± .5F 1/10th Degree 1000 Watts 32 Inches 66 Inches Fresh & Saltwater HC-820M 110-120V 49.9F-94F ± .5F 1/10th Degree 1000 Watts 32 Inches 66 Inches Saltwater
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