Due to their high cost , their 18 GHz frequency limitation , and new laboratory practices , the connectors are now uncommon .
The connectors are expensive , so they are seldom used outside the laboratory where their cost can be justified by their accuracy and convenience .
Due to connectors ' high cost , connectors ' 18 GHz frequency limitation , and new laboratory practices , the connectors are now uncommon .
The connectors are expensive , so they are seldom used outside the laboratory where their cost can be justified by their accuracy and convenience .