"ALLOWS THE USER TO CALIBRATE THE INSTRUMENT OF THE GAS OR VAPOR IN QUESTION AND TO MODIFY ANY PRESET PARAMETERS FOR BETTER ACCURACY; USED ALSO AS A PERFORMANCEN CHECK TOOL; FOR USE WITH SAPPHIRE 30 ANALYZER, AMBIENT AIR, NSN 6630-01-458-0521; MCN 6630-00-C07-6126 NEW MES, INDUST. HYGIENE"