Temperature is the only reason for using the sophisticated tool. We often do a similar function with a infrared gun on the pan.

The actual fluid level is determined by a dipstick that is a special tool. It measures differently than normal sticks in that it is way longer than the tube, such that it works on any trans. It measures by passing through the tube till it hits the pan and then the level on the stick is the level of depth above the pan surface. A normal dipstick is tube specific as it is measuring the level from the tube down.

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