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
Room1-501, Building No. 2, Lixiangjiayuan, No. 15612, Century Road, Shandong(Jinan)Free Trade Zone, Jinan, Shandong, China, 250101