I purchased a cheap china made ultrasonic cleaner. Here is a teardown and review video where I also touch the electrical safety aspcect. The safety grounding was ok so as long as you use a receptacle with a ground connection and a protective fuse (with earth fault detection and isolation) it should be ok. I wouldn’t recommend spilling fluid inside the ventilation holes though so use care.
I purchased a couple of Anytone AT-5189 4m FM radios at a flea market. As the radio is of Chinese origin I was interested in seeing how the chinese engineers is coming along regarding design, waterproofing / IP degree, PCB layout, internal shielding, component selection and general workmanship.
Summary: the radio is surprisingly well designed. A cast alu chassis is made with milled grooves for O rings, professional layed out PCB, proper ground vias and compartmentization, no stray cabling inside. The integrated chips used in the design are LMX1511 synthesizer, MC3311 compander, M62364 DA, KIA278 LDO, RDO7MVS18 driver. Well known integrated circuits.
Some pictures:
