There are very strict QC control for HYSEE's Products.
(1) First,to check the exterior whether is ok,if there is evident defects,it will be selected out as reject.
(2) Secondary,to check that whether does the weight meet the standard.
(3) Third step,to check the whether does the power(Voltage,current) meet the standard.
(4) Fourth step,to make the lifetime(Mechanical life) testing(ageing test ).
Of course,for EM lock,it also has holding-force testing,for waterproof product,there are waterproof testing.