All analog inputs fully isolated! Voltage/temperature loggers with PC networking support 8420-51(8ch), 8421-51(16ch), 8422-51(32ch) All analog channels isolated. Temperature, voltage, humidity, cumulative pulses, rotations Max. 32-channel, 100ms high-speed multi-channel data collection Simultaneous numerical and graphical display Attachable Printer and I/O Module Up to 16 HiLOGGERs can be connected and controlled via LAN.