The best replacement for ultrasonic is cool mist humidifier.

The best alternatives to ultrasonic are rated as following:

★★★★★	cool mist humidifier
★★★★	evaporative humidifier
★★★	jet nebulizer
★★	infrared
★★	steam jewelry cleaner
★★	ultrasound
★★	tumbler
★★	hand scaling
★★	radar
★★	cool mist
★★	evaporative humidifiers
★★	warm mist humidifier
★	evaporative
★	supersonic
★	filter humidifier
★	steam humidifier
★	tumbler brass
★	sonar
★	infrasonic
★	warm mist
★	steam jewelry
★	electromagnetic parking sensors
★	wick humidifier
	compressor nebulizer
	piezo
	galvanic
	tumescent liposuction
	tumbler cleaning
	hand instrumentation
	steam cleaning
	tumbling
	laser liposuction
	tumescent
	mist humidifier
	autoclave
	megasonic
	sonic scaler
	clarisonic
	cool mist humidifiers
	radio frequency

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Scale is based on the average worldwide traffic of ultrasonic in all years. Click on graph for more.

ultrasonic

cool mist humidifier

evaporative humidifier