SI? So, the balance weights are in kg-m; must be big machines or tiny weights in these units. How many Pascals is that at sea level? It's got to be greater than 15.
What really kills me is to see pressure gauges in kg/cm^2. What type of unit is this? Recently, I've seen some kgf - force. If units like these are used, go to the US customary units.
One of the best balance units is g-in, my personal favorite. I guess if you had to you could multiply this by two and a half and call it g-cm, but this is not SI.