Ultrasonic Mini-Foggers operating at 12v AC are still very popular for use in fountains, small ponds, aquariums and terrariums.  The cool fog is generated by the ultrasonic vibration of a ceramic disk which pulverizes water into droplets small enough to float in the air. If you have recently purchased an ultrasonic mister for home use you are familiar with this technology.  This fogger features an indicator light, low-water automatic shut-off switch, replacement disk with disk changing tool and UL listed transformer.  Prolonged use will cover surrounding surfaces with moisture so use accordingly.
Specifications:

• Fogger base with LED operating light
• Low water shut off switch
• UL listed transformer
• 1 year warranty
• Replacement disks available item FG-D1