The Graphtec Data Logger Gl980 is an 8-channel standalone data recorder that can monitor voltage and true RMS. Analog inputs can also be useful with K, J, E, T, R, S, B, N, and W-type temperature sensors, 0-500V or humidity sensors via B-530 sensor. The Graphtec Data Logger Gl980 has a 7″ wide TFT color LCD with waveforms and digital options. Internal RAM supports up to 4 million observations per channel, and the SD card connector supports up to 4GB sd card. The built-in USB connector permits data transmission to a computer or laptop, while the Ethernet port connects to a LAN.