How long does a 300ml tank last?

Expect roughly 6 to 10 hours on low mist and closer to 3 to 5 hours on high, depending on the unit's output. A 300ml tank is sized for a bedroom or office, not a large open living space.

Is $55.98 a good price for this diffuser?

It is the only new price listed, $55.98 at Lowe's as of November 7, 2026, so there is no lower new price to compare it with. Similar 300ml ultrasonic diffusers often sell for less, so check whether this one's design or features justify the gap.

Does it shut off automatically?

Ultrasonic diffusers of this type typically stop when the water level gets too low. Confirm the shutoff feature on the specific listing before buying.

Can I use it with any essential oil?

Yes, it works with standard essential oils diluted in water. Avoid thick or resinous oils and citrus oils that can degrade plastic tanks over time.

How much space does it need?

It is about 5.1 inches wide and 3.9 inches tall, so a nightstand or desk corner is enough. Leave a little clearance around the mist outlet.

Where is the Ultrasonic Essential Oil Diffuser 300ml cheapest?

At Lowe's, for $55.98, as of our latest check.

Ultrasonic Essential Oil Diffuser 300ml

Best price now

$55.98at Lowe'sObserved at 1:34 PM

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Our take on the Ultrasonic Essential Oil Diffuser 300ml

A 300ml ultrasonic aroma diffuser that runs on water and a few drops of essential oil, with a mist output and an automatic shutoff when the tank runs dry. Its footprint is compact at about 5.1 inches wide and 3.9 inches tall, so it fits on a nightstand or desk. The best new price is $55.98 at Lowe's as of November 7, 2026, and only one store currently lists it new, so there is no cheaper new option to compare against.