【Newly Upgraded Aquarium Thermometer】Our aquarium thermometer is made of high quality ABS material, the appearance of environmentally friendly spray paint, exquisite and transparent. 【TDS Detection Function】TDS reading - displays total solids in water, when TDS value is over 300 PM, an alarm flashes. PS: TDS probe is a tester to measure total dissolved solids in water. Generally, the TDS number between 150ppm and 200ppm is the most suitable for fish farming. If it exceeds 300ppm, the water should be replaced or the water quality adjusted. 【Measurement Range】With an accurate temperature sensor on the top of the aquarium, this thermometer digital aquarium monitor displays accurate aquarium temperature. Accuracy within 0.1°C. 【Widely Used】This aquarium thermometer is suitable for different types of water such as fresh water, tap water, salt water, salt water, etc. ‘sea water. It can protect reptiles, fish and small animals from dangerous temperatures.