Pole Clamp with Compass & Phone Holder, Aluminium Data Collector Cradle Bracket for Phone Data Collector Smartphone iPhone, Android Cell Phone, Camera Adjustable Range Pole Clip Measuring Leveling Rod Clamp (0.98"-1.5"/ 25mm-38.2mm) with Rotatable Bracket Smartphone Holder Cradle for 2.4"-4.33" (61mm-110mm) iPhone, Android Cell Phone, Camera The width of the rod clamp is adjustable: (0.98"-1.5"/ 25mm-38.2mm), It can be used with measuring rods, carbon fiber rods, and extension rods with outer diameters of 25mm (0.98 inches), 30mm (1.18 inches), 32mm (1.26 inches), and 35mm (1.38 inches) The width of Smartphone Holder is also adjustable: 2.4"-4.33" (61mm-110mm), Compatible with 2.4"-4.33" (61mm-110mm) iPhone, Android Cell Phone, Camera The compass provides reliable navigation assistance for work in various field environments Press the circular button to quickly connect (or disconnect) the bracket. You can also adjust the bracket's angle with the 12 small round holes on one side of the pole clip