Question

operating a toothed section jack stand
raising
the cup of a toothed section can be raised freely. letting go of the cup will cause it to drop and stop at the next locking point.
locking
this type of axle stand is locked when the cam in the top of the jack stand slides into the toothed section, preventing the cupped section from dropping further. if the cup is at the correct height, the steel pin is inserted as an extra lock.
lowering
check that the vehicle weigh is not sitting on the jack stand, before lowering the cup. if the cup needs to be lowered, the steel pin needs to be removed from the jack stand. then hold the cup with one hand and move the steel handle upwards using your other hand. the cup can now be eased down.
how many locking systems does this jack stand have?

Explanation:

Step1: Identify locking - related text

The cam - toothed section lock and the steel pin as extra lock are mentioned.

Step2: Count locking systems

There are two locking systems: the cam - toothed section lock and the steel pin lock.

Answer:

2