Snap-On diagnostic tool for MB W210 

MT2500 (B/W) or MTG2500 (color and better graphing)  $160 for MTG2500

Main cable, MT2500-5000 or EAX0066L50A, $35

Extension cable, 10' (non-OEM) $14

Cable adapter, 38-pin, MB-1  $40 

Personality key, S-20   $30

MB software cartridge, MT25001101 (through 2001), MT25001103 (through 2003), etc. $126

(MTG2500 only): Internal battery, NiMH, Interstate NIC0558   $49 shipped.