Ultrasonic cleaning instruments for laboratory use; electronic devices for preventing and protecting against bioencrustations; ultrasonic antifouling systems comprised of a control module, ultrasonic transducers, transducer cables, fuse holders and mounting pads; ultrasonic devices for preventing and protecting against bioencrustations; electric devices for preventing, controlling and protecting against algae, all of the aforesaid for use in sea water and fresh water and used on marine vessel...