- Non-Glass construction: Made with a PTC oxide ceramic material, this heater will not crack or shatter in water like glass heaters. It offers longer service life and is safer for aquarium use. - Accurate temperature control: Adjustable submersible heater range from 63°F to 93°F (17°C to 34°C). A typical safe range for most tropical fish is 76°F to 80°F (25–27°C). - LED display and ergonomic design: Three-digit LED display with an external temperature controller for easy operation and enhanced safety. - Over-heat protection: Automatically shuts off when a fault occurs. Helps maintain the tank water at the set temperature. If the water temperature exceeds 36°C, the over-temperature protection activates and the indicator may flash to signal an abnormal condition. - Practical use scenarios: - Tropical freshwater community tanks: Maintains a stable 76–80°F range to support diverse species and reduce stress. - Small nano tanks and betta rooms: Compact, safe design with external control for precise adjustments without disturbing fish. - Quarantine or hospital tanks: Reliable temperature maintenance during treatments or acclimation, minimizing temperature fluctuations and stress.