Features: It is an for ideal Humidity & Temperature Meter instrument with scores of practical applications for laboratory, industrial, engineer and professional. Designed to combine the functions of humidity meter, temperature meter, wet bulb temperature and dewpoint temperature. Small form factor easy to use, with a backlit dual display LCD screen can be used in a dark environment. Unit switcher: C and F; Temperatue mode switcher: normal, dewpoint and wet bulb. Dual display temperature & humidity; resolution 0.01%rh, 0.01 c/0.01 f,max hold and data hold function; auto power off. Specifications: Material: ABS Size: 67x35mm/2.6x1.3in Resolution: 0.01 Battery: 3xAA battery( not included) Note: Please allow 1-3cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1X Digital Psychrometer