1.Stability test.ratio<8%(width from saddle to platform divide by Stand in height).
2.Off-center load test for 10min.. Height<0.12inch
3.1.5times load test for 10min..Height<0.12inch
4.Saddle periphery test for 4points and 4 lift position.
5.Releave valve test>1inch/sec.
6.Other tests,pls see household appliances.