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This product is made from a material that develops color at different temperatures. The temperature can be quickly detected, and the temperature of the water in the aquarium can be measured within a few seconds. Instructions: 1. Remove the wax paper on the back of the product to reveal the adhesive, and then stick it on the outside of the aquarium (please choose the location and then paste it, and then peel off the re-sticking and basically scrapped). Note: Be sure to stick it below the water level, the lower the better. 2. The way to observe the water temperature is to see which number of stains change from black to blue, which is the temperature indicated by that number.