Keys wrote:
  Anyone know the size or type of batteries used in
this model? 
 On the back
  cover it shows three batteries being used to
power the 
 calculator. Thanks in
 > advance 
I have a 27S, which may or not be similar, but does take three button cells
and has markings like what you described.  Mine are MS76.  I think Energizer
357 is equivalent, also SR44.  --Patrick