You have successfully added from to your part list.
Rieker's manual boom angle indicators and boom angle inclinometers are not affected by outdoor elements. These instruments are made tough and will not rust, freeze, or otherwise "hang up" like old fashioned pendulum style boom angle indicators. Like all of our instruments, each boom angle indicator is properly dampened for smooth reliable readings. Designed for easy mounting with two screws allows for quick and efficient retro-fitting in the field.