A visit — yours or an inspector's — is the surest check on a new supplier. Send a date and what you want to see; the request reaches them as an enquiry you can track.
Address
Room 4201, Block B, International Trading Plaza, No. 226 Changjiang Road, Qingdao Economic & Techinical Development Zone, Qingdao City, Qingdao, Shandong, China