I don't own one yet, but am planning to purchase this soon:
https://www.amazon.com/FOXWELL-NT530-Mercedes-Multi-System-Diagnostic/dp/B07XQGSS48/
https://www.amazon.com/FOXWELL-Adapter-Diagnostic-Connector-Mercedes/dp/B07ZRDB3CY/

I don't think any of the cheapo OBD scanners will do what you need.

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1968 220D, w115, /8, OM615, Automatic transmission.
My 1987 300TD wagon was sold and my 2003 W210 E320 wagon was totaled (sheds tear).