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MAF's are extremely difficult to test. You can hook up a multimeter and read the voltages at certain RPM's. Some cars have voltage specs. But the only real way to see what the sensor is doing is to hook up a lab-scope to it. For those not in the know, a lab scope is a machine that you hook up to an electrical circuit. It has a graphing function and displays the voltage in a graph in real time, so you get an accurate picture of what the sensor is doing. Some MAF sensors send voltage signals, but most send a waveform signal. This means that the way you tell how the sensor is performing is by the heighth of the waves and the distance between the top of the waves.
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