I have an ATTEN ST 8800 D. I tried it out and I have a problem with this machine. When I get the machine at 500°C at 50% airspeed. My motherboards (I tried on several) barely heat up to 180°C. I know how to calibrate the machine, but it can't be a calibration of 300°. Anyone has the same problem with this machine. I know buying cheap is buying expensive but a 300° difference is a rip off.