This company has introduced an advanced control for its models 400, 600 and 700 humidifiers. The control is said to be easier to install, allowing for more profit on each installation, incorporates new intelligence technology and delivers optimum performance. A diagnostic circuitry light validates control knob position and checks the outdoor sensor for continuity and the humidity sensor for no reading, ensuring the control is properly operating after installation and reducing return service trips. The water panel/service indicator light alerts homeowners that the water panel needs to be changed.

Research Products Corp., P.O. Box 1467, Madison, WI 53701-1467; (608) 257-8801; fax (608) 257-4357.

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• Research Products Corp.