From the product description, check product page for current description, price and availability:

• Quantity of liquid crystal thermometer: 15 pieces digital temperature strips in total, each measures approx. 13 x 1.8 cm/ 5.12 x 0.71 inches (LW), proper size to use
• Clear temperature scale: simply designed with clear scale, 2 different temperature readings for you, one is Celsius reading, ranges from 18 – 34 degrees Celsius, the other one is corresponding Fahrenheit reading, ranges from 64 – 93 degrees Fahrenheit, suitable for different groups of people
• Convenient to read: 3 colored marking that can indicate the temperature situation, which can change with the water temperature, each color represents different water temperature condition, they can be seen clearly and quickly from the surface
• Easy to use: the thermometer strip is self adhesive one, you can directly stick it to the outside part of fish tank, better to be pasted below the water level, not applicable in the water, you can check the temperature condition of fish tank at any time
• Applicable occasions: suitable for wine bottles, baby bottles, fish tanks, bath water, you can get the accurate reading, green color represents current temperature, blue color represents a bit lower temperature, brown color represents a bit higher temperature