1. All of them are made of plastic non-conductor materials, which can protect the monkey more effectively
2. Exclusive non-conductor material, suitable for magnetic resonance experiment and assisting scientific research
3. The scale of ear rod is 0 ~ 20 mm, and the movable range of fixed column scale is fixedï¼~ï¼ï¼ï¼ï¼ã
4. Lengthened base plate design to provide enough play space