Pulse meters and pulse oximeters.
Griffiths
D M
DM
Ilsley
A H
AH
Runciman
W B
WB
D000758:Anesthesia; D006801:Humans; D008991:Monitoring, Physiologic / Q000295:instrumentation*; D010092:Oximetry / Q000295:instrumentation*; D011674:Pulse