Finally: Scientists build tricorder

The portable electronic device contains a variety of different sensors, plus a microphone on the top of the gadget, that can read five vital signs.

These include body temperature, heart rate, oximetry (blood oxygen levels), ECG waves, heart rate variability and pulse wave transit time (PWTT) – the time it takes for a heartbeat to reach somewhere else in a person’s body. PWTT is related to blood pressure.

Its makers claim the device is 99 per cent accurate in less than 10 seconds.