... 4:Warranty period one year SV-2LZ automatic Smoke meter SV-2LZ Full automatic Smoke meter, which is made according ... 2.Electric suction system, internal microcomputer control, automatic feeding paper, measuring, reseting, washing, automatic measurement show one, two,three times and ... RS-232 interface, convient networking.5.Lack of paper automatic alarm.6.LCD screen display, English menu clew operation7. ...