Hey Dave,
thank you for your research. Most of the sources I found too when I did my research. The proposal saying that the market is worth 500m seems really unprofessional..but that you recognized too^^
Nevertheless the sources don't tell much about the market structures
I mean, they talk about "Multimeters" but well, not about the distribution between benchtops and portables..moreover the industries are not really classified the way I "would" like it..r&d, aoerospace, military..that has nothing to do with electricians or HVAC/R - guys...
Actually it seems pretty hopeless :E
Hans