Length Counter Dual line 4 digit display Accuracy:0.01%,Min display:0.001 Work with waveform pulse, ... ,counting at the same time.2, Accuracy: 0.01%, mini count:0.001, unit changes with sensor ... with output control mode set freely.4, Display: 4 digits display,sensor power supply 12V/24V/30mA available. ... For 8 digits display, please indicate when ordering.5, RS232 or RS485 ...