is of explosion-proof glass, can stand Bubble milk/milk bubble temperature of about 60 ~ 65 ℃;Baby milk temperature about 40 ;Coffee temperature of about 80 ~ 90 ℃ This temperature parts only in needle parts (about tip up to 1.5 cm), do not need to throw in all, this is not a fully sealed design, even into the water, will not be damaged. Please use it correctly , convenient to carry, beautiful and , easy to observe large Numbers