Package contents 3 pieces of adhesive thermometers, the size is suitable for any aquarium. Place it on the container glass outside the aquarium tank. It provides accurate temperature readings Easy to InstallOur aquarium thermometer sticker features self-adhesive design, just peel off the track tape and stick it on the aquarium surface, that's all. AccuracyThe temperature measurements range from 10C to 40C. The error is within 1, allowing you to monitor aquarium temperature changes at any time. No battery and no suction cup to worry about. Widely usedIt can be used to control the temperature of your aquarium, drink, kettle, water tank, greenhouse and any type of pet aquarium or on measure anywhere in your home. Sticker thermometer stickers can test the temperature safely and accurately Product SizeAdhesive thermometer Dimensions: 20 x 130 mm, Suitable for cold water, tropical and saltwater aquariums. The size is suitable for every aquarium. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.