Some common factors for Bucket heat pump dryer quality control:
Appearance
Quantity check
Measurement(weight & size)
Basic function check
Running test(power on)
Internal check
Tape check on silk-screen/painting/electroplate
Rub check on rating label
Hi-Pot test
Earthed resistance test
Power consumption check(input power)
Power cord strain relief test(for European)/pull test(for US)
Fatigue Test for all buttons or adjustable parts
Standby or off power check
Smell test
Temperature test
Bucket capacity check