2 holder on swivel arm . Each holder has 0.75" ,1.25" and 1.375" slot for holding different size probe . Two holder a 8 in apart on 14.5 inch long horizontal arm . 

The horizontal arm is 360 degree swivel without tool 

The vertical angle arm may change the height of 22" range by hex L-key wrench  . The vertical angle arm may swivel 180 degree by hex L-key .

clamp good for 0.5 through 1.5" dia pole