Dino lite rk 10a table top stand and rk 10ex additional arm dino lite rk 10a the rk 10a is a stable universal tabletop stand that features quick release functionality for fast and convenient vertical movement and precise fine focus adjustment that is especially useful at high magnification the stand is compatible with the complete range of digital hand held microscopes the adjustable horizontal arm has a 7in range with 360 rotation and the combination of features and design gives complete