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 blasted my LDG antennatuner some time ago. Or …. I thought I blasted it….. It appeared that it was only the resistor in the SWR detector circuit that got burned out. I replaced that resistor and now its ok again.It was easy to repair. However these small LDG tuners dont take more than 100W max. The designers have used ferrite cores, whereas it would have been a much better idea to use carbonyl cores or air core inductors. The latter doesnt get so easily saturated.
However I must say that the design of the LDG equipment I have seen so far is not very impressive. Why use that BIG chasis when you dont need it? Why use DB9 style connectors on a chassis that is supposed to be watertight? Look at that coax termination there. Both on the board and on the PL259 chassis connector. Why use RG174 teflon coax when you have such crappy terminaions? Perhaps it would be better with no coax at all 🙂 However when the tuner works it works fairly OK. Just dont trust this kind of equipment in a contest or on a dx expedition.
Here is a review of SDR radios currently on the market in the low cost segment: http://www.rtl-sdr.com/roundup-software-defined-radios/