How do I know if I have an EN-A or EN-B instrument?

If you don't know if you have an EN-A or EN-B instrument, check the silver label on the bottom of your device. If you have an EN-A or EN-B instrument, the model number will have "-A" or "-B" on the end (e.g., "DI-730-EN-A" or "DI-730-EN-B"). As a general rule, EN-A instruments were purchased after December 2001 and EN-B instruments were purchased after September 2006. See Non EN-A/EN-B Reference for a reference guide to non EN-A/EN-B instruments.

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