timer duration a bit short, but no problem - just repeat as many times necessary. I decoked a lawnmower cylinder head with two 30 minute runs at 80 deg - came up like new.
I use this on my watch polishing works and always doing good job. Heat control is lifesaver as many parts need heating to get rid from polishing stains. I use fairy(dish washer) as a solution.
The smaller ones are just not enough, 6 liter is what you need!
Good seller, nice communication. One of the better priced 6 liter ultrasonics although sometimes it's more powerful than other times. I wonder if I can check somehow if all 3 motors are still working.Had some problems with the delivery but worked it out otherwise 5 star.
The ultrasonic clear arrived as stated when ordered, however it is ia 10lt washer but only holds 7lt! Not sure why this is! It work as expected but I found it needs more time than you would expect.
Nice quality tank used to clean vinyl records and jewelry works a treat.
Only downside advertisement shows small mesh basket and plastic tube which was not supplied.
Bought this to clean my DCOE weber carbs, found if you use it very hot with a degreasing agent in the water that it works great, it removes grime from places you could never access, only gripe is i should have bought a slightly bigger one .
Robin Farrant 
