Are you looking for a professional, yet hygroscope? these are hygroscopes, made of ABS material. Humidity display resolution is up to 1%, it can clearly display temperature and humidity. They are one of the for you. Features - Material: ABS. - Size: About 4.50X2.50X1.50cm/1.77X0.98X0.59inch. - Made of ABS material, you can use them for a long time. - Large-character display, clear to read. - Low power consumption and high stability and accuracy. - It can clearly display temperature and humidity. - Their surface is smooth, you will have the good skin feeling. Specification - Humidity measurement range 20%~90%. - Humidity display resolution 1%. - The humidity sampling cycle is 10 seconds (1 minute). - Humidity measurement accuracy ±5%. - Rated voltage .5v (2 button batteries). - Temperature measurement range -50 degree centigrade to 70 degree centigrade. - Temperature measurement accuracy ±1 degree centigrade (under normal temperature). Package list: 5 x Hygrothermograph