The tower is reporting an RVR from a transmissometer situated next to the runway
All well and good, but the only airports in Australia that have transmissometers are Sydney & Melbourne. The others rely on approved observers to assess the visibility for ATC, generally by counting runway lights. The resulting RV can't be used for Cat 2/3 approaches, or even Cat 1 when the vis is less than 800m.
Welcome to Australia and its third-world aviation infrastructure. Actually, come to think of it, some so-called third-world airports are better equipped than Australia's!