Simply function to get any item type by internal ID. Adding this since I've seen multiple questions about how to do it.

NetSuite_GetItemType.js

function getItemType(itemID){
  var itemData={};
  try{
    itemData=search.lookupFields({type:search.Type.ITEM,id:itemID,columns:['type','externalid','price','displayname']});
    log.debug('itemData',JSON.stringify(itemData));
  }catch(err01){
    log.error('getItemType('+itemID+').err01',JSON.stringify(err01));
  }finally{
    return itemData;
  }
}