Heart Rate - http://www.data-harvest.co.uk/catalogue/science/secondary/smartq-sensors/smartqsensors/3147 Pulse Oximiter -http://www.data-harvest.co.uk/catalogue/science/primary/general-equipment/primary-fingertip-pulse-oximeter/3907 E.C.G Sensor - http://www.data-harvest.co.uk/catalogue/science/secondary/smartq-sensors/smartqsensors/3279 Polar Heart Rate - http://www.data-harvest.co.uk/catalogue/science/secondary/smartq-sensors/smartqsensors/3148