美国Precisionary Instruments Inc 
美国Precisionary Instruments Inc成立于2004年.
电生理实验需要活的软组织切片，实验的质量取决于切片的质量。脑切片的生存能力，尤其是表层神经元的活性是脑片电生理实验成功的关键因素。美国PI研发的艺术级切片机 VF-200/300可为这些研究提供最高质量的新鲜组织切片,满足不同的研究目的.
Precisionary Instruments Inc. is located in Greenville, North Carolina, a university town east of the Research Triangle. Founded in 2004 by scientists, it is dedicated to promoting technology improvement in bio-medical researches. The company has developed a series of state-of-the-art compresstome™ microtmes to section slices for fresh and fixed tissue for different research purposes.