Tetra Pak Tetra Alfast Plus Standardisation System These are Used Tetra Pak Tetra Alfast Plus Standardisation Systems which consist of Density Meter, Alfa Laval Valves, Flow Meters & Control Panel, currently held in stock at Lockerbie, Scotland. Please note that these Alfast Plus Inline Standardisation Units do on include Computers & Software, as they have been retained by their previous user due to Licence Agreement.