Dear user: Thank you for your attention and understanding of our company's products! In order to let you buy and use the products with more confidence, our company provides trial services for some products. If you really need to try, please download the trial form below, fill it out and send it to our company's email: stkj1988@163.com. Our full-time business personnel will contact you! Jinan Shengtai Contact Number: 0531-86970887