What was the eBay auction item linked here? (It's long since expired from eBay, of course.)

I'm considering buying a '94 E420 and would like to have a better way to read trouble codes than the LED method...

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AlexTheSeal: hack mechanic, inadvertent drifting champ, builder of infernal devices, professional epistemologist

'87 300D Turbo, roadtrip mileage champ (for sale!)
'92 Isuzu Trooper, mudder extraordinaire (for sale!)
'82 Honda Silverwing, cockroach of motorcycles
And various boring daily drivers...