The suitable water temperature for babies is close to body temperature 37 to 40 degrees. Do not use long hot water. Bathing for long periods can cause baby to be tired. Take 5-7 minutes to get a good bath. ●0 months and up. ● Environmental Condition Check (Materials) Body: Styrofoam resin (heat-resistant temperature up to 154°F (70°C)); Temperature sensitive liquid: White kerosene (When using); Rinse the bath water well. For accurate measurements, simply submerge the thermometer into hot water once Please drain the water thoroughly after use. [Precautions] This product is intended to measure the temperature when bathing. Please do not use it for any other purpose. Please be sure to check the temperature with your hands before taking the baby to bath. Hot water becomes hot on the top, so please stir well before measuring. Dropping this product or bumping it or boiling water while it floats may cause damage. Please do not use products that may be damaged or have a run of liquid (red temperature liquid is separated). Please do not leave it in a location below -10 degrees Celsius (-10 degrees C) or use in hot water above 140 degrees Fahrenheit. Keep out of reach of children. Please be careful not to let children touch the glass tube.