... data without interference, exchange meter just, getting difference display, exchange meter just, getting difference display.7 ... .good quality and competitive pricetechnicalpower supply DC5V/ DC12V/ DC24Vcounter speed 10pcs, 300pcs, 3000pcs.display range 0 ... -999999counter range 0-999999input impedance ≥100KΩmax power H≥ ...