Hi, I'm back, good news about getbetterlife.com from youtube. A training viedo by "TATTOOTRAINING".
http://www.youtube.com/user/TATTOOTRAINING
It referred to getbetterlife.com and international tattoo.com
Here is the text on youtube:
machine head - http://www.getbetterlife.com/Professional-Black-Tattoo-Ma..., Armature Bar- Shader https://www.internationaltattoosupply.com/eshop/catalog/C..., This machine has a aluminum frame that i have used to build many machines. It has good balance and geometry . It has iron T-top 10 layer coils. The only thing i had to do was replace the Armature bar and springs. I have bought many china machines and this is the only that has both a cast frame and good coils and only cost $ 12.90
I've also found some reviews about "ds 1052e oscilloscope", the site seems not that bad.