The utility model relates to a health care equipment technical field provides a main and collateral channels pen, include claviform casing, locate PCB board in the casing, locate in the casing with rechargeable battery that PCB board electricity is connected, locate casing one end with electric inductive head of connecting of PCB board and magnetism are inhaled and are fixed in the other end of casing with the probe that PCB board electricity is connected. The utility model discloses in, when examining time measuring, will pop one's head in and install the other end in the casing, need not examine time measuring, the probe can take off, inhales the installation through magnetism between probe and the casing, tears, adorns the convenience open, and this kind of main and collateral channels pen is small and exquisite, easily carries, and convenient travel is at home used.