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 306, Block a, Zhongtie Square, No. 383 Dunhua Road, Shibei District, Qingdao City, Shandong Province, Qingdao, Shandong, China