LOL, testing a VSI from the ground. Hint “ visual slope indicator”. “Visual”and “slope” are important words. Very important, so much so, the indicators are designed to alert the pilot as to direction and directional movements during landing phase as to position of aircraft above or below the glide slope.
Unusable by design from the ground... only dead pilots get that view after CFIT. Google it.
That mentality is about the norm for the core GDSI scammed investor.