I think the Snap-On MT2500 with MB module should set adaptations, I'm relatively sure it should allow one to view them in actual values.

It is very unlikely that a MAF for your car could be anything but the hot hilm that it came with, but there is no scienticfic reason for that fact. The output of hot wire sensors and hot film are both voltage values between about 1v and about 4v. It's the "about" that causes problems. The situation is precise and the calibration can only be a ways off before the adaptation of the system runs out of range. You also may be faced with an early control unit that has the software that could only make an 18% correction. The new units run to 32% correction, either rich or lean.

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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician