The Gravity app isn't incredibly accurate, but it's better than no scale at all. One of the first problems he and his team faced was that Apple's 3D Touch API measures weight on a custom scale from 0.00 to maximum possible force, with 1.00 as the average touch. They solved this by asking users to calibrate the app using objects of a known weight they would have to hand (US nickels).
The SID (Security IDentifier) is a unique ID number that a computer or domain controller uses to identify you. It is a string of alphanumeric characters assigned to each user on a Windows computer, or to each user, group, and computer on a domain-controlled network such as Indiana University's Active Directory.
@file. PsGetSid will execute the command on each of the computers listed in the file. If you want to see a computer's SID just pass the computer's name as a command-line argument. If you want to see a user's SID, name the account (e.g. administrator) on the command-line and an optional computer name. Specify a user name if the account you are running from doesn't have administrative privileges on the computer you want to query.