Hi
We have set up several different validation methods depending on which accessories we are using. Our BrukerVertex instrument have a three different ATR's and two detectors, so I have one method for each combination. These method does not need polystyrene, they only check the "system". Can't you by a new polystyrene disk that can be used with the ATR? I'm not familiar with Nicolet or ValPro, so I don't know who they are set up.