Bath Thermometer Babys' skin is very tender and delicate! You have to pay 100% precaution when bathing!! This card can protect baby hurting from cool or hot water. The card is made of LCD thermometer material. It is waterproof, reusable, refinement, flexible, safe, innocuous to environment, scientific, practical! It is different from traditional mercury and glass thermometer, which baby can easy hurt by its glass and the mercury (mercury is a toxin material) once it was broken!! It is a necessary daily product for baby health care!! Every family need to have one and worth to have one! Usage: Dip completely into bath water for 15 seconds!! The green color indicates the current temperature of the water. If nothing appears on the strip, it means the water is either too hot or too cold.