South Korean electronics giant Samsung has developed a device that can measures body fat with little error.
The device has four electrodes that the user touches with the thumb and one finger of each hand. These send a safe current through the body, measuring the voltage drop as the current flows up one arm and down the other.
A body fat value serves as a main index to determine fatness, which is known to cause many adult diseases.
The device can reveal just how much body fat a person is carrying, the company said. However, it will only be accurate if finger contact is perfect.
To stop people accidentally or deliberately fooling the machine, a subject must gradually increase finger pressure while the device sends the test voltage. Once calibrated, it can weigh up fat content more accurately, it said.