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Mood rings that changed colour based on a person's temperature were all the rage during the 1990s. 

But now there is a much more high-tech, scientific way to track how you're feeling - the Asus VivoWatch with Happiness Index. 

VivoWatch tracks the wearer's activity levels and sleeping habits before awarding their overall wellbeing a numerical score on this index.

The £119.99 Asus VivoWatch tracks the wearer's activity levels and sleeping habits before awarding their overall wellbeing a numerical score on a Happiness Index. It is the first Asus wearable to focus on fitness

It is the first Asus wearable to focus on wellness and fitness.

The watch's sensor uses VivoPulse technology and, during exercise, gives instant and continuous feedback about the wearer's workout using an LED.

When the wearer reaches their aerobic heart rate zone - when cardiovascular exercise effectively burns calories, strengthens the heart, and increases stamina - the LED turns green. 

If the level of intensity is too high, causing the wearer's heart rate to rise to the limit, the LED indicator turns red to warn them of over-exertion.

And while sleeping, the VivoWatch measures the total sleep time, heart rate, and how much they move. 

Once it has collected this activity and sleep information, the watch generates a numeric score on the Happiness Index that offers a summary of the overall healthiness of their lifestyle. 

A low score lets the wearer know that they should adjust their exercise and sleep habits to achieve optimal health. 

The watch's sensor uses VivoPulse technology and, during exercise, gives continuous feedback about the effectiveness of the wearer's workout using an LED.  When the wearer reaches their aerobic heart rate zone, the LED turns green (pictured). If the level of intensity is too high, the LED indicator turns red

And while sleeping, the VivoWatch measures the total sleep time, heart rate, and how much the wearer moves. Once it has collected this activity and sleep information, the watch generates a numeric score on the Happiness Index that offers a summary of the overall healthiness of their lifestyle

It is a much more high-tech and scientific version of the mood ring (pictured), popular in the 1990s

While a normal or high score provides motivation to maintain their healthy lifestyle and try to earn a higher score.

Wearers can also see the scores of family members or friends who also wear the VivoWatch. 

'ASUS is committed to innovation and is always at the forefront of industry trends, allowing us to create products that shape the future and make it better,' said Joe Hsieh, Asus corporate vice president and general manager.

'Asus VivoWatch is our first exciting step into a world where users can access their fitness and wellness data at any time, and receive individually-tailored insights into healthier living. 

'In the near future, we will provide even more solutions that will change users' conception of what fitness and wellness products can do.'

Elsewhere, Asus claims the £119.99 VivoWatch has a 10-day battery life, and the watch case is IP67 water-resistant.  

It goes on sale in the UK in May.