... Pressure Data Logger .1-40 Channels/USB/RS485/Relay .Accuracy:+-(0.2%FS+1) .USB drive:Play&Plug .CE Pressure Data ... the advanced technology, to be designed high quality and performance, isolated, high accuracy, universal use, to be aimed to monitor, record ... 12VDC,24VDC auxiliary power supply for sensors. USB port: plug and play. Support 1GB,2GB,..USB flash driveCommunication: RS485,RS232, MODBUS-RTU ...