A heart activity and blood flow measuring device comprising of a hand held master unit 3 and a plurality of sensor units, wherein the first type is used to measure electro cardio activity of the heart, and the second type is used to measure absorption of infrared and red light by the blood in the region under the sensor unit placed on a human body. The plurality of sensor units will preferably communicate with the master unit and may also receive power from said master unit. The sensors will preferably include a computing component, a means to communicate wirelessly with the master unit, a timing component, memory, signal amplification and digital electronics.
