Your selection yields 7 products:
GL1000
2 CAN, 2 LIN, 1 RS232, 2 digital I/O, 4 analog inputs, storage on SD/SDHC card, optional: LIN, GPS, external display, shunt
GL1010
2 CAN, 2 LIN, 1 RS232, 2 digital I/O, 4 analog inputs, storage on SD/SDHC card, IP65, optional: LIN, GPS, external display, shunt
GL3000
9 CAN, 2 LIN, 2 RS232, 8 digital I/O each, 6 analog inputs, storage on CF card, optional: LIN, WiFi, 3G/UMTS, 8 analog inputs, GPS, external display, shunt, speech recording, digital camera
GL3100
9 CAN, 2 LIN, 2 RS232, 8 digital I/O each, 6 analog inputs, storage on CF card, 4 keys, 1 display, optional: LIN, WiFi, 3G/UMTS, 8 analog inputs, GPS, external display, shunt, speech recording, digital camera
GL3200
9 CAN, 2 LIN, 2 RS232, 8 digital I/O each, 6 analog inputs, storage on SSD, 4 keys, 1 display, optional: LIN, WiFi, 3G/UMTS, 8 analog inputs, GPS, external display, shunt, speech recording, digital camera
GL4000
9 CAN, 2 LIN, 2 FlexRay, 2 RS232, 8 digital I/O each, 6 analog inputs, storage on CF card, 4 keys, 1 display, optional: LIN, WiFi, 3G/UMTS, 8 analog inputs, GPS, external display, shunt, speech recording, digital camera
GL4200
9 CAN, 2 LIN, 2 FlexRay, 2 RS232, 8 digital I/O each, 6 analog inputs, storage on SSD, 4 keys, 1 display, optional: LIN, WiFi, 3G/UMTS, 8 analog inputs, GPS, external display, shunt, speech recording, digital camera