Boom Clamp Stand for MicroscopeFeatures Heavy boom clamp stand (requires 502009 Focus Mount) For use with the PZMIII or PZMIV microscope head Details Between the small horizontal bar and the adjustable forearm Between the adjustable forearm and the middle horizontal bar Between the middle horizontal bar and the boom stand Requirements Requires 502009 focus mount (Sold separately) Boom Clamp Stand without focus mount Type Description Vertical post 39 cm (15. 1) Horizontal post 52 cm