LMI 3030 Master Block     A master block is required for the LMI 241 BWV2 in order to set     the nominal reference position for the flush and gap checks. The     certified 3.0mm gap 0.0mm flush slot is used to the gage.

LMI 3062 Master Block     The 6.0mm gap and the 2.0mm flush offset slot can be used to     verify the accuracy of a gage to a second certified gage position.     The LMI 3062 master block is used for all models of the LMI 241     BWV2 series probes.