How long does one fill last?

HealthSmart rates it at up to 24 hours, but that is on the lowest output. Running it at full mist shortens runtime considerably.

What size room is it for?

It is a personal-size unit, best for a nightstand, desk or small nursery. It will not raise humidity noticeably in a large open living room.

No auto shutoff is advertised. Turn it off when the tank runs low so the unit does not run dry.

There is no filter to replace. Using distilled or filtered water reduces white mineral dust on furniture.

HealthSmart does not list oil compatibility for this model. Add oils only if the manual allows it, since oils can damage the mist plate.

Empty and rinse the tank regularly and wipe the mist outlet. A vinegar-and-water soak removes mineral buildup.

At eBay, for $79.99, as of our latest check.

3 stores we checked sell it, including Carewell, eBay, HealthProductsForYou.com.

$79.99at eBayChecked 49 min ago

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