I use this one, prety good. The reading is the same as the one used in hospital. Good Luck!
http://www.clinicalguard.com/fingertip-pulse-oximeter-cms50dl-p-161.htmlI use this one, prety good. The reading is the same as the one used in hospital. Good Luck!
http://www.clinicalguard.com/fingertip-pulse-oximeter-cms50dl-p-161.html