On the GM10, the main module's 7 segment LED displays the contents of errors.
When E5 and 03 alternate, this means error code E503, indicating that that the SD card was not recognized. For corrective action, see section 5.2, >Troubleshooting> in the user's manual (IM 04L55B01-01EN).
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Modular GM10
For industrial and lab applications, the GM10 offers Bluetooth wireless connection and modular I/O that offers accurate and reliable measurements. The GM10 also supports 920 MHz band wireless communication.