This is a simple addition to a bracket when you want to be able to aim the Head up and down. There are two adjustable disks that allow you to set the ending angle in each direction. Some set screws allow you to adjust the range of movement and it is designed to bolt onto 1/4-20 holes or use the nuts and bolts.
The name says it all, except that there is a Sharpieâ„¢ marker included if you want to make permanent notes on this flat and writable tape measure that also works with a pencil for temporary notes.
If you measure the light output at a given distance before your client is in front of you, then later when you are really shooting, it's easy to always get the exact right exposure without a lot of light-meter readings and extra flashes at your subject.