... /s^Sensitivity choice: 5,10,20mm/mV^Measurement parameters: HR, P-R interval, P-Duration, QRS Duration, Q-T interval, Q-Tc ... , P Axis, QRS Axis, T Axis, R(V5)+S(V1)^Product ... pacing protection^Enduring polarization voltage:±300mV^Noise level: <15μVp-p phone:86-10-82958705