The thermometer changes color depending on the ambient temperature. If the ambient temperature is 27°C, the bottom of the 27°C tick mark turns blue, while the other tick marks remain black. Temperature range 10-40 degrees Measure the temperature of your aquarium, beer and wine barrels, terrariums, greenhouses, terrariums and any pets or anywhere in your home. The correct water temperature is very important for the health of fish, bring beer and wine or use them in the kitchen or at home to monitor the temperature. Small and compact. Easy to install, just tear off the transparent protective film on the front and back of the sticker and stick it on the outer wall of the aquarium. No need to worry batteries and suction cups. The way to observe the temperature of the water is as follows: see which number the dye changes from black to blue, that is, the temperature indicated by this issue Product material: paper Product size: size 13 x 1.8 cm. Product contains: 3 thermometers
