The product is a multi-fucntion thermometer. It can be used alone or used by coding with the alarm system. The real temperature can be dectected and shown on the screen directly. The users can set the max and min temperature. When the real temperature passes the setted temperature, it will send the alarm signal. The user can also connect it with a metal detecting slice as assistance. It applies to the temperature measurement in the daily life and industrial or agricutural production.