<prompt> Main disadvantage of glass bead sterilizer:Technique sensitiveOnly glass instruments can be sterilizedOnly small instruments can be sterilizedNone of the above  <response>: The hottest part of glass bead sterilizer is along its outer rim and the temperature is lowest in the centre of surface layer of salt. To sterilize an instrument properly, one should immerse at least a quarter-inch below the salt surface and in peripheral area of the sterilizer. The main disadvantage of glass bead sterilizer is that only small instruments can be sterilized. Temp 425F - 475FF for 5 sec. 