Twelve Channel Model-ST 1200B Automatic measurement and interpretation tested selectable. 5.7 inch(resolution:320*240)color TFT Display. Print Preview before printing. 12-lead simultaneous acquistion and amplification; Record the 12 ECG Wave form simultaneous; all-digital and full-floating design.1:1 ratio for LCD screen waveforms and output waveforms,net-grid on screen and record paper are the same.