国产精品毛片VA一区二区三区,十八禁 网站视频在线观看撒尿,蜜臀av人妻精品一区二区不卡,色费女人18毛片A级毛片视频,91麻豆产精品久久久久久

Product features:

1. Germany Knauer company imported original valve to ensure product quality;

2. Built in sensor to provide start signal for integrator and workstation;

3. The injection volume is 1ml to 25ml to meet the needs of small-scale preparation in the laboratory;

4. The price is favorable and the cost performance is very good;