A bridge-type ultrasonic atomizer comprises input- and output piezoelectric substrates, first- and second electrodes formed on the input piezoelectric substrate, third- and fourth electrodes formed on the output piezoelectric substrate, a porous nonmetalic-plate formed between the input- and output piezoelectric substrates. A new DMM is created having at least one of the following characteristics: quality and complexity. The two groups of traces are configured to be interleaved with each other such that no two traces from either group are next to any other traces from the same group.