It has been a long time since your post but I would like to know how you came out with the reflow oven from www.tonhz.com
. I bought a F2C reflow oven from them 3 months ago and it has been a headach since the first day. After connecting the serial cable, I realized it was too short so I got a longer one, then when I unscrewed it to replace it for the longer one, the serial interface felt inside the oven case, because it had no bolts but rivets, then I had to make some special allen wrench to open the case because they were of very hard reaching , then once open I found that a wire from the RS-232 converter was loose. I ask Wendy, my contact, how to reconnect it. It took a couple of weeks before to get the answer. With the first try I had a big noise, smoke coming out and the fan stuck. After a few weeks of trying to get in touch with Wendy, she never answered. So I opened the oven: the bolts from the sliding back doors were not tighted so the doors had come out of the way, burning the selenoid, the oven was 220V but the fan was 110V. and the 2 thermical resistances wre burned.
That is my experience with www.tonhz.com
But at the same time I had ordered a CNC machine SD2616, from SUDA, also China. Same problem. Very poor quality bolts and wires, and the worst of it: the machine can work perfectly, and suddenly get crazy and go with another toolpath, ruining the PCB. Then same story, I never got no solution to the problem. They said I had to pay the air ticket to their engineer (China-Honduras-China) or the freight to return that machine and get another one, which come out more expensive than the machine.