【200 Watts Fish Tank Water Heater】: This Aquarium heaters is suitable for 20 to 40 gallons fish tanks, length 10.24″, voltage 110-120V, power cord is 55.1″, temperature range between 59°F~95°F. We also deliberately give each customer a free diving thermometer with temp display, you can observe the water temperature of the aquarium at any time.
【Intelligent Temperature Control】: When water temperature reaches to specified temperature value, water heater will automatically stop heating, when water temperature is lower than the set temperature, turtle tank heater will automatically start heating. Furthermore, automatic safety shut-off feature, and overheating protection. The heater has an indicator light for current.
【Only 100% Submersible Use】: 1. During its heating time, submersible water heater must be full submerged into the water(Including the top knob). Please unplug the power supply when cleaning the fish tank or aquarium water changes. Please wait ten minutes after power off before taking out the heater, otherwise it will burn dry.

【Measuring Range】 The measuring range of fish tank thermometer is -50°C ~ +70°C / -58°F ~ 158°F, the accuracy is +/- 1 degree Celsius. Dimensions: 58×38×15mm. Power supply: LR44 cell battery (included).
【Easy to Read】 You can easily read the temperature in the water through the LCD display of the aquarium digital thermometer. The temperature unit can be switched between °C and °F with the button.
【Steps for Usage】 First press the PWR button of the reptile thermometer; then put the sensor probe into the water; the attached suction cup can stick the LCD screen to the side of the aquarium.