Check about the material.

Because the pure plant essential oil has a certain corrosiveness, the inner tank chooses the same PP material as the pacifier would be much better. It is oil-resistant, water-resistant and chemical-resistant. The shell material can be made of ceramic, aluminum alloy or ABS. These materials are more heat resistant and can take a long life for using.

Check about the water tank capacity.

The larger the capacity, the better, and the more water is filled, which means that the longer the aromatherapy is provided, it is not easy to run out. But now many aromatherapy machines have appliances for anti-dry protection, so we don’t need to worry about it.

Check about the security.

Check with the manfacturer to see if there is any CE, or UL certs for them. Certs are always a presentation for the quality. Also we can check if it has anti-dry protection, auto shut off setting is also needed.

Check to see if there is a lot of noise.

One of the functions of this machine is to help sleep. Whether it can reduce noise or not is also an important standard for model selection.

Check about the functions.

Timer：with the timer function, the machine can be turned off at any time when we fall asleep.
Night light: with night light function and the gear adjustable light is the best.
Music Player: With the function of the music player, we can enjoy the effect of music sound while aromatherapy.
Humidifier: Having a humidifier effect, our throat will not be dry in the room.

Check about the appearance.

Nice look with outstanding design would be the best choice.