Ridiin Units are currently held as the standard measurement system throughout the civilized portions of Graha, much like SI Units on Terra. And much like Imperial units on Terra, there exist other measurement systems used more readily in other parts of the world. However for the most part we'll focus on Ridiin Units.

The four basic units of Ridiin measurement consist of Length, Time, Temperature, and Mass

Length: Arshin
Derived units of Length: Dyum (1/36th Arshin), Verzh (1/12 Arshin), Pyad (1/6th Arshin), Tsazh (2.333 Arshin), Virst (1320 Arshin), and Miil (7920 Arshin)

Time: Vtor
Derived units of Time: Korot (60 Vtor), Dya (60 Korot), Den (24 Dya), Ned (13 Den), Mesya (4 Ned), Voz (10 Mesya and 6 Den)

Temperature: Degrees Kol

Mass: Zol
Derived units of Mass: Dol (1/32 Zol), Lot (40 Zol), Berkh (400 Zol)