1.The right water temperature is very important for the health of your fish, a aquarium thermometer is very necessary. The thermometer column is very sensitive, will always change according to the temperature. 2.Due to lighting effect,monitor's brightness,manual measurement and etc, there could be some slight differences in the color and size between the photo and the actual item. sincerely hope that you can understand. 3.Made of high quality acrylic material, sturdy, durable and long service life. Tanks and brine shrimp hatching tool should be cleaned and disinfected routinely. 4.The right water temperature is very important for the health of your fish, a aquarium thermometer is very necessary. 5.The thermometer column is very sensitive, will always change according to the temperature. 6.The Hang-On Glass Thermometer can be read easily and precisely by attaching it directly to the aquarium glass.