Pupils of all ages are keenly interested in how physical and mental stress affects their heart rate. The sensing clip (pleth) can be attached to a finger or ear lobe to measure either blood flow (pulse waveform) or heart rate (beats per minute).Activities:Heart rate changes due to activityRecovery ratePulse rateEffect of food (chocolate) or mild stimulants (caffeine)Remote logging set up from the computerEffect of music on pulse rate