It's not a "joke" but a home-brew (h/b) tool for reading DTCs stored in MB cars. A very handy tool to have for the later model MBs.

As Texholdem said, there's a sch and parts list in MENU#2 that shows what you need to build one. Nice tool to find out a direction to go when t/s your car's problems.

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Regards . . . . JimF
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'94 S500 Cpe

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