The Inspector'sTEST products are designed to perform the required sprinkler system's alarm and water flow test. They can also be utilized to test the opening of a dry-pipe or preaction valve and the trip time from when the valve is opened until the arrival of water at the furthest point in the system. 

Location

On wet systems, Inspector'sTEST are to be located anywhere downstream of the waterflow alarm, which could be at the sprinkler riser or remote from the riser. Some jurisdictions have requirements or preferences to locate the inspector's test remotely from the riser, so this is at the discretion of the AHJ.
FM Global requires that a wet system's Inspector'sTEST be located remotely from the riser (FM Global 2-0 2.6.5).
Dry and preaction systems should have the Inspector'sTEST located on the end of the most distant sprinkler pipe for each system.