The Australian-designed device uses electronic microsensors to measure a patient's critical signs, including their hydration level, was launched on Friday

The sensor's inventor and Australian National University professor Mark Kendall said hydration is an important and overlooked factor in aged care settings.

"Multitudes of studies show that 20 per cent of things that go wrong for people in aged care settings are directly attributable to their hydration levels being poorly managed," he said.

"We might think, 'What's the big deal? Have a glass of water.' But as we get older our ability to know when we're dehydrated, those receptors get weaker and weaker. That drops off, and becomes another thing people providing care have to respond to."

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Professor Kendall said the device would improve systems "from a different century" still used to measure patients' hydration levels. "We use little colour charts on the walls of toilets - people are asked to inspect the colour of their urine. We use a pinch test. People get weighed before and after [urinating]. These are poorly managed approaches not in step with the technology available today."

Professor Kendall said the microsensor device represented a strategic step forward in the growing category of personalised health technology, like smartwatches, which was important for workers on mining and construction sites in warm climates.

"The microsensor gains access to all manner of signals today that today's wearables, which are essentially toys, cannot do," he said.

"The way we do that is these microstructure go within a hair's breadth of the skin to gain access to signals."