Sorry that I did not make myself clear. What I meant was what to inspect when you are purchasing a tripod at a shop. Eg: is the lock really working, expanding & collapsing the tripod are smooth & etc (I really have no idea what to check/test).
I've gone through the process of choosing the right tripod. I have also sorted out on the ballhead to use.
Check thru dents over the legs which can make extending / retracting the legs problematic, , look for broken/cracked knobs / locks that tightens extensions ard the legs, smooth central columns that locks well and if the rubber foot tips / spikes are intact. I concerned if the tripod head fits the tripod nicely as well
Mostly is the
(1) Extending/retracting of the legs -> Do it on all legs X5 times & watch for jamming
(2) Locking of the legs & able to hold w/ the recommended weight load applied
(3) Locking of the center column & able to hold w/ the recommended weight load applied