universal MAF tester....
 

Has anyone used this thing? If you youtube "maf tester" there are several official mechanic shows that show how to check to see if a MAF is working.

Neat thing was, that they took a seemingly good MAF and tested it showing that it was on the way out and causing idling problems......

Totally unnecessary, you can do the same thing with a simple (and much cheaper and more useful) digital multimeter…………