ECG Machine: (1)Single channel ECG machine with measurement. (2)Manual/Auto/Arrhythmia Analysis ... ×240 graphic, 3.8 inch LCD High resolution thermal printing system High resolution digital filter Built-in USB or RS232, optional ... -pThreshold≤20μVSensitivityAuto 2.5, 5, 10, 20, 40mm/mVRecording system High resolution thermal printerPaper speed 25, 50mm/s±3%Recording ...