The Fingertip Holder is an accessory of Go2sleep. If you have Go2sleep already, you can wear it on your fingertips by using it which can improve the stability and accuracy of monitoring. If you have no Go2sleep, click HERE to buy one. The Fingertip Holders get three sizes which are small (S), medium(M), large(L) Why use fingertip holder? 1. There are more capillaries on the fingertip than the finger pulp. Compared to the finger pulp, wearing Go2sleep on your fingertip will get more stability. 2. The perfusion index is stronger when wearing Go2sleep on the fingertip than wearing on the finger pulp. 3. The fully wrap structure of the fingertip holder make the wearing process more fixable and stable. 现在的想法是