E-BAM OR E-PAM - NOT THE SAME DESPITE THE NAME!

MET ONE INSTRUMENTS E-BAM PORTABLE BETA GAUGE

                                                                             

             E-PAM

Which would you purchase?  The E-BAM portable dust monitor or the E-PAM dust monitor set in a commercial case?  Please don't confuse the two!  They tried to use a similar product label but there is no comparison.