The bosch gr 500 professional measuring rod is the perfect tool for measuring all floor heights its robust high quality aluminium profile means durability and longevity in the workspace it is extendible up to 5m and is designed for use under extreme conditions it is appropriate for use with bosch model numbers grl 400 h grl 300 hv grl 300 hvg bl 200 gc gol 20 gd gol 26 gd professional