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One side has "hatching" cut into it to catch the fluid in the squares. The other side is smooth, so that smooth side does not reliably read fluid level. Only read from the "cut hatching" side.
Also to consider: The dipstick goes in at an angle through the tube, so it picks up fluid from the tube if you just filled/added fluid. This gives you a false reading unless you wait a while before checking the fluid.
Also, insert it so the cross-hatched area is on top as it goes in and comes out. Otherwise, the cross-hatched area will smear against the side of the tube and cause inaccurate readings.
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.