... Selection I, II, III, avR, avL, avF, VWave 5-lead: 2 channels 3-lead: 1channelGain ×2.5mm/mV, ×5.0mm/mV, ×10mm/mV, ×20mm ... Measuring and Alarm Range 0~250bpmResolution 1bpmMeasuring Accuracy ±2bpm or ±2%, which is greaterAlarm Accuracy ±2bpmTEMPChannel dual-channelMeasuring and Alarm ... I, II, III, avR, avL, avF, VWave 5-lead: 2 channels 3-lead: 1channelGain ×2.5mm/mV, ×5.0mm/mV, ×10mm/mV, ×20mm ...